Is an automatic pool cover worth it for a pool in the Algarve?

The climate here is wonderful for pool owners. More than 300 days of sunshine a year, warm evenings that stretch well into October, and enough heat in summer to make a pool genuinely essential rather than decorative.

That same climate creates specific pressures. Evaporation is relentless. UV degradation accelerates. Atlantic winds can lift an improperly secured cover clean off its moorings, and the coastal air carries enough salt to corrode inferior metalwork within a season or two.

We have been installing automatic covers across this region since 2008. Eighteen years gives you a reasonable sample size. You see which systems hold up and which need constant attention, you learn which features clients actually use and which they pay for once and then ignore, and you develop a clear sense of what works in these conditions specifically rather than in theory.

This is what that experience has taught us.

Why does an automatic cover make sense here?

Because a cover only works if it gets used, and an automatic one gets used. A manual cover takes ten minutes of awkward physical effort that nobody feels like making at the end of a long day, so it stays folded in the equipment room. An automatic cover deploys at the press of a button in under two minutes.

That difference is not about convenience for its own sake. Clients with automatic covers actually keep their pools covered when they should be covered, which is why everything downstream improves: heating costs, chemical consumption, cleaning time, evaporation losses.

Evaporation gives the point particular urgency. A medium-sized uncovered pool loses 4 to 6 millimetres of water a day in summer, which on a standard 8 by 4 metre pool works out at close to 5,000 litres a month. That figure sits comfortably alongside the research: a study of pools in the Balearic Islands, a climate closely comparable to this one, measured average evaporation of 4.4 litres per square metre per day (Hof and colleagues, Water, 2018).

Cover the pool and most of that stops. Research at California Polytechnic State University measured around 95 per cent less evaporation from a covered pool, although the figure assumes the cover stays on (Muleta, 2016), which brings the argument back to where it started. Water supply pressures across the region continue to increase, and we have written separately about what drought means for pool owners here.

Which cover systems do we install, and why?

We fit PS Cover, a Spanish manufacturer based near Alicante with forty years in the trade, and every cover in the range carries NF P90-308 certification. Two things decided it. The first is that the range covers surface and submerged installation properly, so the cover is chosen to suit the pool rather than the pool being adapted to suit the cover. The second is the slat itself.

PS Cover slats are 17 millimetres thick and 75 millimetres wide, heavier and broader than much of what is sold, and the practical result is more buoyancy and a flatter surface when the cover is closed. They carry internal water circulation chambers that stop water sitting still inside the slat, which is where algae otherwise establish, and they hold the highest hail resistance rating from the VKF institute. Each cover is measured and made to order in Spain.

TERRA, mounted at the surface

The straightforward answer where there is no pit and no appetite for building one. The Standard runs on a low-voltage motor by remote control, with the drum in aluminium anodised to 20 microns against corrosion and supports in stainless steel or lacquered aluminium. The Solar version takes its power from a panel on the support, which means no trenching for cables and an installation completed in a day.

PACIFIC, submerged

Four configurations, and the difference between them is where the roller goes. DECK houses it in a compartment at the pool floor or built as a step or bench, closed with a panel finished in the pool's own material. TOP covers the compartment with a grate in Iroko from controlled forests or in composite, and comes as TOP 1 at the first step, TOP 2 in a submerged bench and TOP 3 at the pool floor. CAVE hides the roller inside the pool wall itself, which keeps the whole swimming area clear and suits pools where every metre counts. DUO is the one to know about if the pool already exists, because it houses the roller in a three-beam compartment with two finished panels and needs no structural work.

PVC or polycarbonate slats

PVC slats are opaque and block light completely, which suppresses algae and is the safer default for a pool that stands unused for stretches. They weigh 4.3 kilograms per square metre. Polycarbonate slats are transparent to sunlight and let the water keep gaining heat under a closed cover, which PS Cover puts at 4 to 6 degrees, at 3.5 kilograms per square metre. On a pool with a heat pump, the polycarbonate slat and the machine work on the same problem from opposite ends.

What does NF P90-308 certification actually mean?

It means the cover has been independently tested against a legal safety standard rather than described as safe by whoever sells it. NF P90-308 requires that the cover supports the weight of an adult, 100 kilograms minimum, without collapsing or allowing submersion. It mandates UV resistance testing, and it requires the cover to work with the pool's filtration and chemical treatment without creating dead zones where algae grow unchecked.

This is not a marketing designation. It is enforced in France and recognised across the European Union. Covers that meet it have been tested and verified. Covers that do not should not be described as safety covers, whatever their promotional material claims.

Portugal has no equivalent regulatory framework for pool safety equipment, and there is no legal requirement to install a certified cover. The physics of child safety do not change at the border. A cover meeting NF P90-308 offers verifiable protection, and one that does not is a convenience feature with uncertain safety characteristics. We install only certified systems.

How safe is a certified automatic cover?

A certified cover is a genuine physical barrier. Closed properly, it supports the weight of a child, or of an adult who walks onto it, because the standard includes load testing specifically to verify that. This is the primary reason to install one, particularly in a house with young children.

Drowning is a real risk to children in Portugal, not an abstract one. The child safety association APSI recorded more than fifty children and teenagers drowned in the country between 2020 and 2023, as reported by Portugal Resident.

The barrier only exists when the cover is deployed, which is where automatic systems separate themselves decisively from manual ones. Clients use automatic covers consistently because using them costs nothing in effort. Manual covers, however good, tend to be left open or half secured.

One clarification matters. A cover is not a substitute for supervision or for perimeter fencing. Portuguese law does not mandate pool fencing for private residences, and we recommend it anyway. A cover is one layer of protection and a fence is another, and the two together reduce risk far more than either alone. For clients who want both, we supply removable child safety fences made by Piscine Sécurité Enfants, a French manufacturer, meeting NF P90-306.

Who benefits most from an automatic cover?

Three kinds of owner, in our experience. Families with young children or pets, for whom the certified load-bearing capacity justifies the investment on its own. Holiday home owners who are away for long stretches and need the pool to look after itself. And anyone heating a pool, where the energy saved usually makes the case without any help from the other two arguments.

The rental market has added a fourth consideration. Several of our rental property clients now list an automatic cover as a premium amenity, and it appears to resonate with guests travelling with small children.

If you heat your pool, the cover and the heat pump belong together. Evaporation is the largest single route by which a heated pool loses the warmth you have paid for, so an uncovered heated pool spends the night heating the sky.

If you swim only occasionally, do not heat the pool, and have no particular safety concern, a good manual cover may serve you perfectly well at lower cost. We would rather tell you that than sell you something you do not need.

Do you need one if your pool already has a manual cover?

It depends entirely on whether you use the manual one. If you deploy it every evening and after every swim, it is doing its job, and the automatic version buys you time and effort rather than any new function. Evaporation reduction, heat retention and debris exclusion are the same either way.

If the manual cover spends most of its life rolled up because deploying it is a nuisance, then switching changes your pool's running costs and cleanliness measurably. You will use the automatic one because it is easy to use. That is the whole of the argument.

Frequently asked questions

Can an automatic cover be fitted to a pool that already exists?

The TERRA surface range fits any pool with a suitable surround and installs in a day, with the solar version needing no cable trenching at all. Among the submerged models, the PACIFIC DUO is designed to go into an existing pool without structural work. The other submerged configurations depend on what the pool was built with, so they follow a site assessment rather than a catalogue.

Do polycarbonate slats really heat the water?

They do. Polycarbonate slats are transparent to sunlight, so the water beneath goes on gaining heat while the cover is closed, and PS Cover states a rise of between 4 and 6 degrees. PVC slats do the opposite by design, blocking light entirely to suppress algae. Which is right depends on whether the pool is heated and how much of the year it is used.

Does an automatic cover count as a safety barrier?

A certified one does. The covers we install are certified to the French standard NF P90-308, and when locked they prevent unsupervised access by children under five. The cover opens only with the key control. It is not, and will never be, a substitute for watching children near water.

How do automatic covers hold up in coastal conditions?

Better than they used to, though salt air tests any finish. The TERRA drum is anodised aluminium at 20 microns specifically to resist corrosion, with supports in stainless steel or lacquered aluminium. We advise on where to position the roller and the end supports to limit direct salt exposure, and we build cleaning into the routine from the first day rather than after the first corrosion.

Which pools should not have an automatic cover?

Overflow pools and pools with steps running the full length of one side. NF P90-308 excludes those configurations, so a cover fitted to them cannot be certified and cannot be counted as a barrier. Where a pool is built that way we say so before quoting and recommend a removable child safety fence instead.

If you want to know which configuration suits your pool, get in touch.