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Calculate expected annual evaporation and filter backwash water loss to verify whether water loss is normal or indicative of a leak.
A drop in pool water level is usually driven by natural thermal evaporation rather than a structural leak. The calculator below models surface area, ambient temperature distributions, and filter backwashing habits to provide expected baseline water replenishment values.
Under standard summer conditions, an open-air swimming pool naturally loses 5 to 12 mm of water per day due to solar evaporation and wind exposure. For a 100 m² pool, this equates to 500 – 1200 Liters/day. Daily losses exceeding 15–20 mm indicate potential pipe or structural leakage requiring diagnostic testing.
Pool water evaporates continuously based on air/water temperature, humidity, and wind. Evaporation peaks during summer; this tool estimates seasonal water loss from your surface area.
Periodic sand filter backwashing discharges particulate matter along with water. Sizing factors include pump flow rates, backwash cycle durations, and weekly frequency.
If actual water meter consumption significantly exceeds calculated evaporation and backwash benchmarks, perform a standard bucket test or consult our leak detection technicians.
Enter pool surface area and filtration details to estimate annual water replenishment.
Evaporation: 81.8 m³ | Backwash: 65.0 m³
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Annual Evaporation Loss
Peak: 0,0 m³ | Off-season: 0,0 m³
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Annual Filter Backwash Loss
1x/week, 5 min
Swimming pool evaporation rates are primarily influenced by ambient air temperature, relative humidity, and surface wind speed. Use the engineering matrix below to cross-reference natural losses against potential structural leaks.
| Climate Condition | Temp Range | Daily Evap (mm) | 50 m² Daily Loss | Wind Factor | Engineering Evaluation |
|---|---|---|---|---|---|
| Cool & Calm / Indoor Pool | 10 – 20 °C | 2 – 3 mm / day | 100 – 150 Liters / day | Low (0-5 km/h) | Standard baseline natural evaporation rate. |
| Mild & Light Breeze Outdoor Pool | 20 – 28 °C | 4 – 6 mm / day | 200 – 300 Liters / day | Moderate (10-15 km/h) | Typical seasonal benchmark for temperate zones. |
| Hot & Sunny Outdoor Basin | 28 – 35 °C | 7 – 9 mm / day | 350 – 450 Liters / day | High (15-25 km/h) | Intense evaporation; automated leveling recommended. |
| Extreme Heat & Arid Wind Zone | 35 – 45 °C | 10 – 14 mm / day | 500 – 700 Liters / day | Severe (25+ km/h) | Peak loss; thermal covers significantly reduce consumption. |
Use this industry-standard diagnostic protocol to determine whether abnormal water loss is caused by extreme climate evaporation or an underlying hydraulic leak.
Top up pool water to standard mid-skimmer or overflow weir height. Completely isolate automated make-up valves and mechanical float lines for the duration of the test.
Principle: Automated filling solenoids must remain strictly isolated during the 24-hour diagnostic window.
Fill a 5-liter plastic bucket with pool water and place it on the top pool step. Mark the water level inside the bucket and the exterior pool water line on the bucket shell with waterproof tape.
Principle: Submerging the bucket ensures thermal equilibrium between the sample and the main basin.
Keep bathers out of the pool for 24 hours. After exactly 24 hours, measure the millimeter decrease inside the bucket (evaporative loss) versus the outer pool water drop.
Principle: Ambient solar radiation and wind affect both surfaces equally, isolating evaporation from leaks.
If the pool drops significantly more than the bucket (e.g. 4 mm bucket vs 16 mm pool), a structural membrane or plumbing pipe breach exists. Repeat with the pump ON vs OFF to isolate pressure versus suction leaks.
Principle: Higher water loss with pump running points to return plumbing; equal loss with pump off indicates basin shell failure.
First, calculate your expected evaporation and backwash baseline with this tool. If actual level drops are significantly higher, perform a standard 24-hour bucket test: Place a weighted bucket filled with water on the pool steps, match the water levels inside and outside the bucket, and measure both 24 hours later. If the pool water drops noticeably faster than the bucket, a structural or plumbing leak is present.
Evaporation is driven by ambient temperature, wind velocity, relative humidity, and solar exposure. Hydraulic benchmarks classify normal daily evaporation as: 2–3 mm/day (10–20°C), 4–6 mm/day (20–30°C), 7–9 mm/day (30–40°C), and 10–14 mm/day in extreme arid climates (>40°C).
Monitor filter pressure gauges closely and perform backwashing strictly when differential pressure increases by 0.5–0.7 bar above clean operating baseline. Avoiding excessive backwashing duration saves significant fresh water, heating energy, and dissolved chemicals.
High-grade thermal solar blankets and automated slat covers physically isolate the water surface from ambient air currents, reducing evaporative water loss by 90% to 95% while drastically curbing nighttime thermodynamic heat loss.
Yes. In deck-level overflow pools, the active water mirror extends across the overflow channels and water constantly cascades over weirs, leading to approximately 15% to 25% higher evaporative and splash losses compared to recessed skimmer designs.