How to Prevent Evaporation and Save Water

Water loss isn’t just about refilling the pool—it’s lost heat, chemicals, and money. The good news is that a handful of clever tweaks can dramatically reduce evaporation and keep your pool comfortable year-round.

Save Water – Why evaporation matters (quick maths)

A typical backyard pool (say 8 m × 4 m) losing just 5 mm/day will drop about 160 L/day—that’s 1,120 L/week and 4,800 L/month. Reducing evaporation quickly pays for itself in water, energy, and chemical savings.

Start here: rule out leaks first.

Do a 24–48 hr bucket test.

1. Bring water to normal level and turn off features (sheer descents, fountains).
2. Place a bucket on a step, with the water level inside equal to the outside level; mark both.
3. Compare drops after a day (pump on) and again (pump off).

Pool falls more than bucket? Likely a leak. 

1- Use a cover (the biggest saver)

• Thermal/sun bubble blankets: Affordable and easy to apply on a roller, they are great for heat retention and evaporation reduction.
• Automatic slat covers: A premium look, excellent savings, and safety benefits.
• Liquid solar covers: A monolayer you dose regularly—handy when a physical cover is impractical (best in calm conditions).

Bubble/thermal blankets are not safety devices; always keep fencing compliant and supervise.

2- Add shade and break the wind

Wind strips the moist “boundary layer” off your water.

• Shade sails or pergolas over part of the pool
• Windbreaks: hedges, screens, or louvres (placed to keep leaves out)
• Thoughtful landscaping: low-litter plants near the pool edge

3- Tame water features & aeration

Water in the air = water you don’t get back.

• Run fountains/spillovers for short windows, ideally evenings.
• Dial back high, splashy returns; aim eyeballs to reduce surface agitation in hot, windy periods.
• Keep toys and cannonballs to a sensible zone to limit splash-out.

4- Keep the heat in the pool

• Cover every night.
• Lower the set-point slightly on heaters in heatwaves.
• Solar heating + cover is a powerful combo: harvest by day, hold it overnight.

5- Optimise circulation for clarity, not chop

Filtration is essential, but white-water isn’t.

• Run longer on low RPM (variable-speed pump) for improved filtration with reduced surface agitation and lower operating costs.
• Keep the water level 2/3 up the skimmer mouth for steady skimming without gulping air.

6- Balance water chemistry

Balanced water evaporates less heat and wastes fewer chemicals when topped up.

• Hold pH 7.2–7.6, TA 80–120 ppm (fibreglass often 60–100), CYA in range for your system, and keep FC steady.
• Scale on tiles and cells increases heat loss; stay on top of calcium hardness and clean the salt cell as needed.

7- Minimise backwashing waste

• Cartridge filters use zero backwash water—great water savers.
• If you run sand/DE, only backwash when pressure rises 8–10 psi above clean, and consider a periodic deep clean to extend intervals.
• Use a leaf canister in leaf season to lighten the filter load.

8- Harvest and re-use where you can

• A rainwater tank + top-up line (with proper filtration) can offset seasonal losses.
• Direct deck drainage to garden beds rather than stormwater, where allowed.
• Check local rules before plumbing any collection system.

9- Smart automation

• Automatic water levellers keep levels optimal and can flag abnormal top-ups (a leak hint).
• Timers/smart controllers: align pump/feature schedules with cooler, less windy times.

10- Daily habits that add up

• Skim and empty baskets so circulation stays efficient.
• Rinse salt off nearby metalwork/stone to prevent weathering and splash concerns.

Quick decision guide

• Want max savings, minimal fuss? Thermal blanket + roller.
• Premium, low-profile look? Automatic slat cover.
• Cover won’t work? Try liquid solar cover, add shade/windbreaks, and tune pump/feature schedules.
• Using sand/DE? Consider a cartridge filter to slash backwash losses.

What Pool Life can do

• On-site evaporation and leak audit (bucket test assist)
• Cover supply & install (blankets, rollers)
• Pump/filter upgrades (variable-speed, oversized cartridges)
• Automation setup and schedule tuning
• Seasonal check-ups to keep chemistry stable and bills low