A hot, windy Australian afternoon can take more water from an uncovered pool than most owners expect. That loss is not just water disappearing into the air - it also means more top-ups, more chemical balancing and, if the pool is heated, more energy spent replacing lost warmth. Knowing how to reduce pool evaporation is one of the simplest ways to make pool ownership less costly and more water-wise.
Evaporation is a normal part of owning a pool, especially through a dry summer. The aim is not to eliminate it completely. The practical goal is to slow it down with a few well-chosen measures that suit your pool, your local climate and the way your family uses it.
Why pool evaporation adds up
Pool water evaporates when warm water at the surface turns into vapour and moves into the surrounding air. The process speeds up when there is a large difference between the water temperature and air temperature, low humidity, direct sun and moving air across the water.
In much of Australia, wind is often the biggest overlooked factor. A pool may sit in full sun all day without losing as much water as one exposed to a steady breeze. Wind removes the humid layer of air sitting immediately above the water, allowing more water to evaporate.
A heated pool can also lose heat and water quickly overnight. The heater may then work harder the following day to restore the preferred temperature. That is why evaporation control is about more than conserving water. It protects the energy you have already put into the pool.
Before making changes, check that the water loss is truly evaporation and not a leak. Mark the water level on the skimmer or tile line, then compare it over several days with the pump operating normally. A sudden or unusually high loss, soggy ground near pipework, or a falling level when the pool is covered may point to a leak that needs professional attention.
How to reduce pool evaporation with a pool blanket
For most households, a pool blanket is the single most effective place to start. It creates a physical barrier over the water, dramatically reducing contact between the pool surface and dry, moving air. It also helps retain heat, which can reduce the energy required from a pool heater.
A well-fitted blanket should cover as much of the water surface as practical. Small gaps around curved edges or steps are normal, but a cover that is far too small will leave a large area exposed. Put it on whenever the pool is not in use, including overnight. This is often when warm water meets cooler air and heat loss is greatest.
Choose the cover for the way you use the pool
Bubble-style solar blankets are popular because they are lightweight, affordable and can help capture warmth from the sun. They suit many family pools, particularly where the cover is rolled on and off regularly. A roller makes a significant difference to convenience, which matters because the best blanket is the one you will actually use.
A heavier insulated cover may provide stronger heat retention, particularly for a heated pool, but it can be less convenient to handle. Slatted automatic covers can offer excellent day-to-day ease and safety benefits, although they are a larger investment and need to suit the pool design.
No cover is maintenance-free. Rinse off dust and leaves, allow it to dry when storing for a long period, and keep it away from sharp edges. A damaged or brittle blanket will not sit flat on the water and will be less effective.
Reduce wind across the water
Once a cover is in place, look at the pool's exposure. You do not need to turn the backyard into a wind tunnel-free enclosure, but slowing the breeze before it reaches the water can make a worthwhile difference.
Solid fencing, carefully positioned screening, hedges and established planting can all act as windbreaks. The best option depends on the direction of prevailing winds, local council requirements, the available space and how much shade you want around the pool. Dense solid barriers can sometimes push wind up and over the area, while more open screens can filter it more gradually.
Be careful with large trees close to the pool. They may provide welcome shade and wind relief, but they can also drop leaves, flowers and bark into the water. More debris means more cleaning and can affect water balance. Choose low-litter planting where possible and leave enough access for maintenance.
In exposed coastal, rural or elevated locations, a practical combination of boundary screening and a quality pool blanket is generally more reliable than relying on either measure alone.
Keep pool temperature sensible
Warmer water evaporates faster, so every extra degree can increase ongoing water and energy use. For many Australian households, a comfortable swimming temperature sits around 26°C to 28°C. If your pool is mainly used for exercise, it may be comfortable at the lower end of that range.
This does not mean you need to give up a warm pool. It means heating should be controlled rather than left to run unnecessarily. Set a realistic temperature, use a timer or smart controller, and keep the blanket on when the pool is idle. If you are away for a week or the weather turns cool, reduce the temperature set point rather than maintaining peak swimming conditions.
Solar pool heating can be an efficient way to extend the swimming season, especially when paired with a blanket that holds onto the collected warmth. Without a cover, much of that heat can escape overnight and the system must work harder to replace it. Simple installation, lasting benefits often come from treating heating and evaporation control as one system rather than separate decisions.
Manage water features and circulation times
Waterfalls, fountains, deck jets and spa spillovers look great, but they increase the amount of water exposed to air. Fine spray and moving water evaporate faster than a still pool surface, particularly on hot or windy days.
There is no need to avoid water features altogether. Run them when people are enjoying them, then switch them off when the pool is unattended. The same thinking applies to any aeration setting on the return jets. Aim the jets slightly downward if they are currently breaking the surface and creating constant ripples.
Your filtration system still needs to run long enough to keep the water clean and properly circulated. Reducing evaporation should never come at the expense of water quality. Instead, set the pump schedule for the hours that suit your pool's cleaning needs and avoid operating decorative features for long periods simply out of habit.
A solar pool pump can be a sensible option for suitable pools, particularly where daytime filtering aligns with strong solar production. It can reduce reliance on grid electricity while keeping water moving when it needs to be. The correct pump size and flow rate matter, so seek advice rather than choosing purely on price.
Maintain water chemistry and check for hidden losses
Evaporation leaves minerals and dissolved chemicals behind. As water is topped up, the balance can gradually shift, so regular testing remains essential. Keep pH, sanitiser and total alkalinity within the recommended range for your pool system. Balanced water protects surfaces and equipment, and it makes swimming more pleasant.
Do not assume every drop in water level is caused by summer weather. Common leak points include pump seals, filter connections, skimmer lines, light fittings and cracks around fittings. If you are adding water far more often than nearby pool owners, or if the level continues to fall during mild weather with the blanket on, arrange an inspection.
A simple routine that makes a difference
Evaporation control works best as an everyday habit. Cover the pool after swimming, turn off water features when they are not being enjoyed, keep the temperature sensible and review wind exposure before the next hot season. These small actions protect water, pool chemicals and heating costs at the same time.
For a heated, windy or frequently used pool, the right blanket and heating setup can pay for themselves through lower running costs and less water waste. If you are unsure which approach suits your pool, Solazone is happy to help you make a practical choice that lets you enjoy the water and feel at ease about what it costs to run.