
BES ENGINEERING SIMULATION
GENERAL POOL OZONE SIDESTREAM
Preliminary ozone sidestream design using one canonical Engineering Core for contact hydraulics, Pool response, KPI assessment, graphs, and report results.POOL OZONE ECOSYSTEM
Pool Ozone Sidestream System
Engineering Core v0.6.0 · Pool main circulation and ozone sidestream treatment remain separate hydraulic systems.BES Pool Ozone Sidestream Simulation
ENGINEERING SIMULATION · NOT LIVE TELEMETRY1. Pool & Operating Inputs
Enter Pool context, selected equipment, independent hydraulic flows and ozone treatment schedule.
POOL / PROJECT
CONTEXT / REFERENCE BASISProject fields do not add hidden physics multipliers. Water Temperature selects only the nearest published KPI #5 reference condition; it does not alter C_pool(t) or interpolate CT.
EQUIPMENT
OZONE TREATMENT SCHEDULE
Advanced Engineering Assumptions
Collapsed by default. Confirm project-specific decay and T10 basis before implementation.
2. BES Recommended Engineering Design
Live recommendation from the current Pool context. It never overwrites the current applied design until you choose Apply.
3. Current Applied Engineering Design
Live diagram driven only by the editable applied equipment, hydraulics and operating schedule.




Performance Summary
Review KPI #1–5 from sidestream contact through Pool ozone exposure.
CONTACT + HYDRAULIC PERFORMANCE
VIEW CALCULATION
VIEW CALCULATION
AVERAGE POOL OZONE CONCENTRATION
VIEW CALCULATION
Average Pool Ozone Concentration
Average Pool C = (1 ÷ 24 h) × ∫ final representative stabilized 24 h C-pool(t) dt- Pool Volume
- 200,000 LOPERATOR INPUT
- Q-side
- 25,000 L/hCALCULATED
- C-side
- 0.00955689705436388 mg/LCALCULATED
- Pool decay coefficient
- 0.442 h⁻¹ENGINEERING ASSUMPTION
- Simulation time step
- 1 minBES DESIGN BASIS
- Simulation duration
- 72 hBES DESIGN BASIS
- Operating schedule
- 60 min ON / 30 min OFFOPERATOR INPUT
- Evaluation window
- Final representative stabilized 24 hBES DESIGN BASIS
2.18139540768051 mg·min/L/day ÷ 1,440 min/day0.00151485792200036 mg/L · 6.06% · BELOW TARGET
≥ 0.025 mg/L · BES Preliminary Pool Ozone Concentration Target
Final representative 24-hour average from a simulation that remains continuous across day boundaries. Calculation method: trapezoidal integration.
BES Preliminary Pool Ozone Concentration Target. Pool response uses the verified mass-balance model without resetting Pool C at day boundaries.
KPI #5 is calculated live from the same C_pool(t) used by KPI #4.
POOL MICROBIAL OZONE EXPOSURE
CURRENT APPLIED DESIGN
CTcycle = ∫ final stabilized cycle C_pool(t) dt= 0.1363 mg·min/LActual trapezoidal integral; exposure continues through ON and OFF periods.VIEW CALCULATION · KPI #5
CTcycle = ∫ actual C_pool(t) dt = 0.1363 mg·min/L
- Source of truth
- CURRENT LIVE POOL SIMULATION C-pool(t)
- Primary formula
- CTcycle = ∫ final stabilized 90-min cycle C-pool(t) dt
- Primary cycle result
- 0.136337212980137 mg·min/L · 60 min ON + 30 min OFF
- Operating schedule
- 60 min ON / 30 min OFF
- Integration window
- Final representative 24 h · simulation hour 48–72
- Time step
- 1 min
- Integration intervals
- 1440
- Actual C-pool(t) series basis
- 1441 boundary points from the current final-24h Pool response
- 24h cumulative exposure
- 2.18139540768051 mg·min/L/day · actual final-24h integral
- 24h consistency check only
- 0.00151485792200036 mg/L × 1440 min = 2.18139540768051 mg·min/L/day
- Average consistency
- 2.18139540768051 ÷ 1440 = 0.00151485792200036 mg/L · error 0 mg/L
- Method
- Trapezoidal numerical integration over the same Pool response series used by KPI #4 and the Pool C graph
- Provenance
- Current applied equipment, hydraulics, schedule and editable engineering assumptions
- Limitation
- Reference-equivalent exposure is an engineering comparison and does not replace field microbiological validation or establish equipment suitability.
MICROBIAL REFERENCE COMPARISON
- Fastest numerical accumulation
- E. coli · 14.4 min
- Slowest numerical accumulation
- Legionella pneumophila · 2 days 18 hr 1 min
- Reference CT accumulated numerically within modeled window
- 5 / 5
- Longest required reference
- Legionella pneumophila · 6.00 mg·min/L · 2 days 18 hr 1 min
COMPARE OPERATING MODES · CURRENT CYCLE VS CONTINUOUS 24 h
Both columns are independently simulated from their respective actual C_pool(t) series. Equipment, units, MTE, hydraulics, contact basis and decay assumptions remain the same; only the operating schedule changes. This is an engineering comparison only.
5°C · pH 6–7
CT_pool = ∫ C_pool(t)dtCurrent operating cycle: 60 min ON + 30 min OFF = 90 min
Reference: Cycle 1 · 14.4 min into cycle · ON period
- Schedule
- 60 min ON / 30 min OFF
- Current Pool Water
- 30.00°C · pH 7.50
- Published Reference
- 5°C · pH 6–7
- Temperature correction
- NOT APPLIED
Estimated time is a numerical Pool CT accumulation comparison only.
VIEW BASIS
Source organizationWorld Health Organization
Source documentWater Treatment and Pathogen Control
Reference table / sectionTable 3.7
Reference typeWHO LITERATURE GUIDELINE REFERENCE
CT value / range0.020 mg·min/L
Temperature5°C
pH6–7
Published literature outcome99% inactivation · 2-log
Source notesOzone CT99 value adapted from Hoff (1986).
LimitationsApplies to the cited water-treatment conditions and suspended organisms; it is not a swimming-pool regulatory standard.
VIEW LIVE CALCULATION
A. Published Reference CT0.020 mg·min/L
B. Current Pool simulation sourceCurrent live C_pool(t), continued with the same state and equations for up to 168 h
C. Cumulative Pool CTCT_pool(t) = ∫ C_pool(τ)dτ
D. Initial 24-hour resultCT_pool,24h = 2.181 mg·min/L
E. Threshold searchFind first timestep where CT_pool(t) ≥ CT_reference; crossing is resolved inside the timestep from the live trapezoidal segment.
Time step / maximum intervals1 min · 10080 intervals
Published Reference CT = 0.020 mg·min/L
Threshold search: first time CT_pool(t) ≥ 0.020 mg·min/L
Initial 24-hour Pool CT = 2.181 mg·min/L
Total elapsed = 14.38 min
Equivalent = 0.24 hr
Converted clock time = 14.4 min
Cycle 1 · 14.4 min into cycle · reached during ON
24-hour Pool CT / numerical ratio basis2.181 mg·min/L
Numerical CT Ratio109.07× · 24-hour Pool CT ÷ Published Reference CT
InterpretationNumerical magnitude comparison only.
Condition handlingCurrent Pool Water 30.00°C · pH 7.50; nearest published condition only; temperature correction NOT APPLIED.
5°C · pH 6–7
CT_pool = ∫ C_pool(t)dtCurrent operating cycle: 60 min ON + 30 min OFF = 90 min
Lower reference: Cycle 1 · 65.3 min into cycle · OFF period
Upper reference: Cycle 2 · 43.1 min into cycle · ON period
- Schedule
- 60 min ON / 30 min OFF
- Current Pool Water
- 30.00°C · pH 7.50
- Published Reference
- 5°C · pH 6–7
- Temperature correction
- NOT APPLIED
Estimated time is a numerical Pool CT accumulation comparison only.
VIEW BASIS
Source organizationWorld Health Organization
Source documentWater Treatment and Pathogen Control
Reference table / sectionTable 3.7
Reference typeWHO LITERATURE GUIDELINE REFERENCE
CT value / range0.100–0.200 mg·min/L
Temperature5°C
pH6–7
Published literature outcome99% inactivation · 2-log
Source notesOzone CT99 range adapted from Hoff (1986).
LimitationsApplies to the cited water-treatment conditions and suspended organisms; it is not a swimming-pool regulatory standard.
VIEW LIVE CALCULATION
A. Published Reference CT0.100–0.200 mg·min/L
B. Current Pool simulation sourceCurrent live C_pool(t), continued with the same state and equations for up to 168 h
C. Cumulative Pool CTCT_pool(t) = ∫ C_pool(τ)dτ
D. Initial 24-hour resultCT_pool,24h = 2.181 mg·min/L
E. Threshold searchFind first timestep where CT_pool(t) ≥ CT_reference; crossing is resolved inside the timestep from the live trapezoidal segment.
Time step / maximum intervals1 min · 10080 intervals
Published Reference CT = 0.100 mg·min/L
Threshold search: first time CT_pool(t) ≥ 0.100 mg·min/L
Initial 24-hour Pool CT = 2.181 mg·min/L
Total elapsed = 65.29 min
Equivalent = 1.09 hr
Converted clock time = 1 hr 5 min
Cycle 1 · 65.3 min into cycle · reached during OFF
Published Reference CT = 0.200 mg·min/L
Threshold search: first time CT_pool(t) ≥ 0.200 mg·min/L
Initial 24-hour Pool CT = 2.181 mg·min/L
Total elapsed = 133.09 min
Equivalent = 2.22 hr
Converted clock time = 2 hr 13 min
Cycle 2 · 43.1 min into cycle · reached during ON
24-hour Pool CT / numerical ratio basis2.181 mg·min/L
Numerical CT Ratio10.91×–21.81× · 24-hour Pool CT ÷ Published Reference CT
InterpretationNumerical magnitude comparison only.
Condition handlingCurrent Pool Water 30.00°C · pH 7.50; nearest published condition only; temperature correction NOT APPLIED.
15°C · pH 6–9
Nearest available reference condition: 15°C · no interpolation
CT_pool = ∫ C_pool(t)dtCurrent operating cycle: 60 min ON + 30 min OFF = 90 min
Reference: Cycle 5 · 56.0 min into cycle · ON period
- Schedule
- 60 min ON / 30 min OFF
- Current Pool Water
- 30.00°C · pH 7.50
- Published Reference
- 15°C · pH 6–9
- Temperature correction
- NOT APPLIED
Estimated time is a numerical Pool CT accumulation comparison only.
VIEW BASIS
Source organizationWorld Health Organization
Source documentGuidelines for Drinking-water Quality, Third Edition incorporating the First and Second Addenda
Reference table / sectionTable 7.6
Reference typeWHO LITERATURE GUIDELINE REFERENCE
CT value / range0.630 mg·min/L
Temperature15°C
pH6–9
Published literature outcome99% inactivation · 2-log
Source notesTemperature-specific Giardia CT99 reference. It is retained separately from the 5°C range.
LimitationsNo automatic temperature interpolation is applied. The cited CT is condition-specific.
5°C · 0.500–0.600 mg·min/L · Table 3.7
15°C · 0.630 mg·min/L · Table 7.6
VIEW LIVE CALCULATION
A. Published Reference CT0.630 mg·min/L
B. Current Pool simulation sourceCurrent live C_pool(t), continued with the same state and equations for up to 168 h
C. Cumulative Pool CTCT_pool(t) = ∫ C_pool(τ)dτ
D. Initial 24-hour resultCT_pool,24h = 2.181 mg·min/L
E. Threshold searchFind first timestep where CT_pool(t) ≥ CT_reference; crossing is resolved inside the timestep from the live trapezoidal segment.
Time step / maximum intervals1 min · 10080 intervals
Published Reference CT = 0.630 mg·min/L
Threshold search: first time CT_pool(t) ≥ 0.630 mg·min/L
Initial 24-hour Pool CT = 2.181 mg·min/L
Total elapsed = 415.99 min
Equivalent = 6.93 hr
Converted clock time = 6 hr 56 min
Cycle 5 · 56.0 min into cycle · reached during ON
24-hour Pool CT / numerical ratio basis2.181 mg·min/L
Numerical CT Ratio3.46× · 24-hour Pool CT ÷ Published Reference CT
InterpretationNumerical magnitude comparison only.
Condition handlingCurrent Pool Water 30.00°C · pH 7.50; nearest published condition only; temperature correction NOT APPLIED.
22°C · pH not stated
CT_pool = ∫ C_pool(t)dtEXTENDED MODELED EVALUATIONReference CT is not reached during the first 24 h. The current operating model was therefore continued beyond 24 h without resetting Pool concentration.
REFERENCE CT ACCUMULATED NUMERICALLYCurrent operating cycle: 60 min ON + 30 min OFF = 90 min
Reference: Cycle 33 · 26.1 min into cycle · ON period
- Schedule
- 60 min ON / 30 min OFF
- Current Pool Water
- 30.00°C · pH 7.50
- Published Reference
- 22°C · pH not stated
- Temperature correction
- NOT APPLIED
Estimated time is a numerical Pool CT accumulation comparison only.
VIEW BASIS
Source organizationWorld Health Organization
Source documentWater Treatment and Pathogen Control
Reference table / sectionTable 3.9
Reference typeWHO LITERATURE REFERENCE
CT value / range4.40 mg·min/L
Temperature22°C
pHNot stated
Published literature outcome99% inactivation · 2-log
Source notesIllustrative value estimated from preliminary data; WHO reports substantial variation by temperature and analytical method.
LimitationsNot a universal ozone CT standard. Published CT values vary with temperature, study method and analytical endpoint.
VIEW LIVE CALCULATION
A. Published Reference CT4.40 mg·min/L
B. Current Pool simulation sourceCurrent live C_pool(t), continued with the same state and equations for up to 168 h
C. Cumulative Pool CTCT_pool(t) = ∫ C_pool(τ)dτ
D. Initial 24-hour resultCT_pool,24h = 2.181 mg·min/L
E. Threshold searchFind first timestep where CT_pool(t) ≥ CT_reference; crossing is resolved inside the timestep from the live trapezoidal segment.
Time step / maximum intervals1 min · 10080 intervals
Published Reference CT = 4.40 mg·min/L
Threshold search: first time CT_pool(t) ≥ 4.40 mg·min/L
Initial 24-hour Pool CT = 2.181 mg·min/L
Remaining CT after 24 h = 4.40 − 2.181 = 2.219 mg·min/L
Continued integration: model state continues beyond hour 24 without reset.
Hour 24 CT = 2.181 mg·min/L
Hour 48 CT = 4.363 mg·min/L
Total elapsed = 2906.06 min
Equivalent = 48.43 hr
Converted clock time = 2 days 0 hr 26 min
Cycle 33 · 26.1 min into cycle · reached during ON
24-hour Pool CT / numerical ratio basis2.181 mg·min/L
Numerical CT Ratio0.50× · 24-hour Pool CT ÷ Published Reference CT
InterpretationNumerical magnitude comparison only.
Condition handlingCurrent Pool Water 30.00°C · pH 7.50; nearest published condition only; temperature correction NOT APPLIED.
Temperature not stated · pH not stated
CT_pool = ∫ C_pool(t)dtEXTENDED MODELED EVALUATIONReference CT is not reached during the first 24 h. The current operating model was therefore continued beyond 24 h without resetting Pool concentration.
DERIVED LITERATURE EXPOSURE · NUMERICAL COMPARISON ONLY · CT ACCUMULATEDCurrent operating cycle: 60 min ON + 30 min OFF = 90 min
Reference: Cycle 45 · 0.9 min into cycle · ON period
- Schedule
- 60 min ON / 30 min OFF
- Current Pool Water
- 30.00°C · pH 7.50
- Published Reference
- Temperature not stated · pH not stated
- Temperature correction
- NOT APPLIED
Estimated time is a numerical Pool CT accumulation comparison only.
VIEW BASIS
Source organizationWorld Health Organization
Source documentGuidelines for Drinking-water Quality, Second Edition, Volume 2: Health Criteria and Other Supporting Information
Reference table / sectionLegionella chapter · Ozone discussion
Reference typeDERIVED LITERATURE EXPOSURE
CT value / range6.00 mg·min/L
TemperatureNot stated
pHNot stated
Published literature outcomeapproximately 99.99–99.999% inactivation · 4–5 log
Source notesDerived comparison: approximately 0.3 mg/L ozone × exposure within 20 min ≈ 6 mg·min/L.
Derived basis0.3 mg/L × 20 min ≈ 6 mg·min/L · not a WHO CT standard
LimitationsWHO reports that ozone eradication results in real water systems remain ambiguous and that adequate residual/contact time may be difficult to maintain.
VIEW LIVE CALCULATION
A. Published Reference CT6.00 mg·min/L
B. Current Pool simulation sourceCurrent live C_pool(t), continued with the same state and equations for up to 168 h
C. Cumulative Pool CTCT_pool(t) = ∫ C_pool(τ)dτ
D. Initial 24-hour resultCT_pool,24h = 2.181 mg·min/L
E. Threshold searchFind first timestep where CT_pool(t) ≥ CT_reference; crossing is resolved inside the timestep from the live trapezoidal segment.
Time step / maximum intervals1 min · 10080 intervals
Published Reference CT = 6.00 mg·min/L
Threshold search: first time CT_pool(t) ≥ 6.00 mg·min/L
Initial 24-hour Pool CT = 2.181 mg·min/L
Remaining CT after 24 h = 6.00 − 2.181 = 3.819 mg·min/L
Continued integration: model state continues beyond hour 24 without reset.
Hour 24 CT = 2.181 mg·min/L
Hour 48 CT = 4.363 mg·min/L
Total elapsed = 3960.87 min
Equivalent = 66.01 hr
Converted clock time = 2 days 18 hr 1 min
Cycle 45 · 0.9 min into cycle · reached during ON
24-hour Pool CT / numerical ratio basis2.181 mg·min/L
Numerical CT Ratio0.36× · 24-hour Pool CT ÷ Published Reference CT
InterpretationNumerical magnitude comparison only.
Condition handlingCurrent Pool Water 30.00°C · pH 7.50; nearest published condition only; temperature correction NOT APPLIED.
Published ozone CT references apply under their cited experimental or treatment conditions and generally to microorganisms suspended in water. They are used here for engineering reference comparison and are not a swimming-pool microbiological certification or substitute for field microbiological testing.
PRELIMINARY ENGINEERING ASSESSMENT
KPI #5 acceptance policy is not yet approved. This preliminary assessment does not establish microbial safety or final equipment suitability.
SUPPORTING ENGINEERING RESULTS
Equipment Capacity Panel
Loading values are supporting engineering indicators. Pool ozone level is assessed by KPI #4; KPI #5 remains a separate microbial reference assessment until an acceptance policy is approved.
ADVANCED ENGINEERING
5. Performance Over Time
Explore four approved KPI target graphs plus two target-free supporting engineering graphs. Select a graph for a full-screen view.
ENGINEERING CORE · FINAL DAY
C-sub — Contact Inlet C
Ozone transfer into Q-subCore C-sub is zero while the ozone source is OFF.
ENGINEERING KPI · CURRENT APPLIED DESIGN
Contact CT
Contact Outlet C × T10Scalar engineering KPI for the current applied design. No artificial time-series is generated.
ENGINEERING KPI · CURRENT APPLIED DESIGN
Sidestream Hydraulic Turnover
Q-side × Active Runtime ÷ Pool VolumeScalar engineering KPI for the current applied design. No artificial time-series is generated.
ENGINEERING CORE · FINAL DAY
C-side — Ozone Sidestream Return
After contact decay and dilution into Q-sideCore C-side is zero while the ozone source is OFF. No approved Pool acceptance target is applied.
Engineering result — no approved acceptance target
ENGINEERING CORE · FINAL DAY
Pool C — Average Pool C KPI
Bulk Pool residual · final representative operating dayPool C continues first-order decay during source OFF. KPI status uses the final representative 24-hour Average Pool C.
ENGINEERING CORE · OPERATING CYCLES
Pool Cycle Exposure — Engineering Trend
Integrated bulk Pool C across each ON + OFF periodValues are trapezoidal integrals of the flow-through Pool mass-balance trajectory. Contact CT is a separate contact-zone quantity and is not plotted here.
Engineering trend — no approved Pool acceptance target
INPUTS, PROVENANCE & REPORT BASIS
System
WDS3000P × 1
300 mg/h per unit · 300 mg/h totalContact CT basis
0.60 × 2.25
Contact Outlet C × T10 only; never cycle durationCycle Exposure basis
Flow-through Pool response
Trapezoidal ∫ Pool C over each ON + OFF cycle from the continuous multi-day responsePool type
hotel
BES design assumptionBather load
medium
BES design assumptionUnits · Complete selected configuration
1
BES design assumptionQ-main · Pool Main Circulation Flow
100,000 L/h
BES design assumptionQ-sub · Ozone Contact Sub-flow
400 L/h
BES design assumptionQ-side · Ozone Treatment Sidestream Flow
25,000 L/h
BES design assumptionContact decay
0.120 h⁻¹
BES design assumptionPool decay
0.442 h⁻¹
BES design assumptionEngineering Design Basis & Limitations
C-sub / Contact Inlet C
BES Preliminary Design Target ≥ 0.50 mg/LContact concentration target only. It does not verify whole-system ozone capacity.
Contact CT
BES Preliminary Design Target ≥ 1.00 mg·min/LContact Outlet C × T10. This is a BES preliminary contact-process design target, not a Pool exposure target or regulatory requirement. Any organism-specific comparison requires an approved, explicitly provenanced reference dataset and defined operating conditions.
Sidestream Hydraulic Turnover
BES Preliminary Design Target ≥ 2.00 volumes/dayQ-side × Sidestream Active Runtime ÷ Pool Volume. Runtime follows the current operating cycle; Q-main remains independent.
Whole-System Ozone Capacity
Engineering capacity indicator · no approved acceptance targetDaily transferred ozone mass and normalized dose expose equipment scale. They remain separate from contact and hydraulic coverage PASS/FAIL.
PASS means the current applied design meets all three BES preliminary contact and hydraulic coverage targets. It does not by itself establish final whole-system ozone capacity, equipment suitability, regulatory certification or third-party microbial validation. Final performance depends on actual water quality, ozone demand, hydraulic conditions, operation, commissioning and field verification.
Simulation results are preliminary engineering estimates for project review and field verification.

General Pool Ozone Sidestream Engineering Simulation Report
BES Preliminary Engineering Design
Project / System Inputs
BES Recommended Design
Current Applied Design
PASS applies only to the three listed preliminary contact/hydraulic criteria.
SUPPORTING EQUIPMENT CAPACITY INDICATORS
POOL-LEVEL ASSESSMENT USES KPI #4 · BES PRELIMINARY TARGET ≥ 0.025 mg/LLoading values are supporting engineering indicators. Preliminary sizing status requires all four BES criteria, including Average Pool C.
FAIL · Average Pool C 0.0015 mg/L against ≥ 0.025 mg/L

Engineering System Design
Independent Pool circulation and ozone sidestream
3. Current Applied Engineering Design
Live diagram driven only by the editable applied equipment, hydraulics and operating schedule.




Hydraulic Design Summary

BES Preliminary Design Performance
Side-stream design and representative final-day Pool response
Whole-system equipment sufficiency is evaluated separately.
VIEW CALCULATION
VIEW CALCULATION
VIEW CALCULATION
0.0015 mg/L · 6.06% · BELOW TARGET · BES Preliminary Pool Ozone Concentration Target ≥ 0.025 mg/L
Live calculation: Final 24 h Pool Ozone Exposure 2.1814 mg·min/L ÷ 1,440 min = 0.00151485792200036 mg/L.
POOL MICROBIAL OZONE EXPOSURE
CYCLELive calculation: CT_pool = ∫ C_pool(t) dt using trapezoidal integration of the same live Pool basin concentration series as KPI #4. Cycle exposure includes both ozone ON and residual OFF periods.
FAIL · Four BES preliminary criteria required
Supporting Engineering Results

Performance Over Time
Approved KPI target graphs and target-free supporting engineering graphs
5. Performance Over Time
Explore four approved KPI target graphs plus two target-free supporting engineering graphs. Select a graph for a full-screen view.
ENGINEERING CORE · FINAL DAY
C-sub — Contact Inlet C
Ozone transfer into Q-subCore C-sub is zero while the ozone source is OFF.
ENGINEERING KPI · CURRENT APPLIED DESIGN
Contact CT
Contact Outlet C × T10Scalar engineering KPI for the current applied design. No artificial time-series is generated.
ENGINEERING KPI · CURRENT APPLIED DESIGN
Sidestream Hydraulic Turnover
Q-side × Active Runtime ÷ Pool VolumeScalar engineering KPI for the current applied design. No artificial time-series is generated.
ENGINEERING CORE · FINAL DAY
C-side — Ozone Sidestream Return
After contact decay and dilution into Q-sideCore C-side is zero while the ozone source is OFF. No approved Pool acceptance target is applied.
Engineering result — no approved acceptance target
ENGINEERING CORE · FINAL DAY
Pool C — Average Pool C KPI
Bulk Pool residual · final representative operating dayPool C continues first-order decay during source OFF. KPI status uses the final representative 24-hour Average Pool C.
ENGINEERING CORE · OPERATING CYCLES
Pool Cycle Exposure — Engineering Trend
Integrated bulk Pool C across each ON + OFF periodValues are trapezoidal integrals of the flow-through Pool mass-balance trajectory. Contact CT is a separate contact-zone quantity and is not plotted here.
Engineering trend — no approved Pool acceptance target

Pool Microbial Reference Comparison
Live Pool-basin CT accumulation compared with published literature references
MICROBIAL REFERENCE COMPARISON
Current Pool Water: 30.00°C · pH 7.50 · Temperature correction: NOT APPLIED
NO MIDNIGHT RESET
E. coli
- Reference ozone CT
- 0.020 mg·min/L
- Published outcome
- 99% inactivation · 2-log
- Estimated Time to Reference CT
- 14.4 min
- Published Reference
- 5°C · pH 6–7
REFERENCE CONDITION MISMATCH Current Pool Water: 30.00°C · pH 7.50. Temperature correction: NOT APPLIED.
World Health Organization · Table 3.7Poliovirus 1
- Reference ozone CT
- 0.100–0.200 mg·min/L
- Published outcome
- 99% inactivation · 2-log
- Estimated Time to Reference CT
- 1 hr 5 min – 2 hr 13 min
- Published Reference
- 5°C · pH 6–7
REFERENCE CONDITION MISMATCH Current Pool Water: 30.00°C · pH 7.50. Temperature correction: NOT APPLIED.
World Health Organization · Table 3.7Giardia lamblia
- Reference ozone CT
- 0.630 mg·min/L
- Published outcome
- 99% inactivation · 2-log
- Estimated Time to Reference CT
- 6 hr 56 min
- Published Reference
- 15°C · pH 6–9
REFERENCE CONDITION MISMATCH Current Pool Water: 30.00°C · pH 7.50. Temperature correction: NOT APPLIED.
World Health Organization · Table 7.6Cryptosporidium
- Reference ozone CT
- 4.40 mg·min/L
- Published outcome
- 99% inactivation · 2-log
- Estimated Time to Reference CT
- 2 days 0 hr 26 min
- Published Reference
- 22°C · pH not stated
REFERENCE CONDITION MISMATCH Current Pool Water: 30.00°C · pH 7.50. Temperature correction: NOT APPLIED.
EXTENDED MODELED EVALUATION · reached after 24 h using continuous state integrationWorld Health Organization · Table 3.9Legionella pneumophila
- Derived literature exposure
- ~6.00 mg·min/L
- Published outcome
- approximately 99.99–99.999% inactivation · 4–5 log
- Estimated Time to Reference CT
- 2 days 18 hr 1 min
- Published Reference
- Temperature not stated · pH not stated
REFERENCE CONDITION MISMATCH Current Pool Water: 30.00°C · pH 7.50. Temperature correction: NOT APPLIED.
EXTENDED MODELED EVALUATION · reached after 24 h using continuous state integrationWorld Health Organization · Legionella chapter · Ozone discussion
Engineering Capacity & Design Basis
Current applied capacity calculations, assumptions and limitations
WHOLE-SYSTEM OZONE CAPACITY
SUPPORTING ENGINEERING INDICATORS · POOL-LEVEL ASSESSMENT USES KPI #4Loading values are supporting engineering indicators; preliminary sizing status requires all four BES criteria.
FAIL · Average Pool C 0.0015 mg/L · Target ≥ 0.025 mg/L
C-sub Basis
Target ≥ 0.50 mg/L for contact-inlet concentration. It does not independently establish whole-system capacity.
Contact CT Basis
Target ≥ 1.00 mg·min/L. Contact Outlet C × T10; BES preliminary contact-process design basis, not a Pool exposure target.
Sidestream Turnover Basis
Target ≥ 2.00 volumes/day. Q-side × active runtime ÷ Pool Volume; hydraulic coverage only.
Whole-System Capacity Basis
Equipment, Units, MTE, ozone duty and water volume are supporting indicators; Pool-level PASS/FAIL uses Average Pool C KPI #4.
Pool Response Basis
Continuous flow-through Pool response, distinct from Contact CT; final representative 24-hour Average Pool C target ≥ 0.025 mg/L.
