Property Care
September 4, 2026
9
Niels Schuit
Swimming pool maintenance in Spain is not a summer task. On the Costa del Sol a private pool needs attendance for close to eleven months of the year, because the water stays warm enough to keep growing algae long after the last guest has gone home. Owners who treat the pool as seasonal usually discover the cost of that assumption in March, when the water has turned and the only remedy is a full drain and refill. This is what a private pool actually needs through the year, what it costs to keep in condition, and where the expensive failures come from.
A pool is a small water treatment plant with a decorative surface. It has a circulation system, a filtration system, a dosing system and a structure, and each of those has its own failure pattern. Weekly service on the Costa del Sol normally covers water testing and chemical correction, skimmer and pump basket clearing, surface and floor cleaning, backwashing the filter when needed, and a check of the water level.
What it does not automatically cover is the equipment itself. Pumps, filters, valves, salt cells and timers are usually treated as separate items, quoted when they fail rather than inspected before they do. That distinction matters more than owners expect, because the pool almost never fails at the water. It fails at the plant room, and by the time the water shows it, the repair is already larger.
The coast gives a pool a long, hot season and a short, mild rest. Water temperatures stay high into October, and biological activity in an untreated pool continues well past the point where a northern European owner would expect it to stop. Evaporation is the other half of the picture. Through July and August an uncovered pool can lose a noticeable amount of water every week, and a falling level is not simply a cosmetic problem. If the water drops below the skimmer mouth the pump draws air, runs dry and can be destroyed in a single afternoon.
Then there is dust. The combination of coastal wind, dry ground and, in some months, Saharan dust loads the water with fine particulate that a filter has to work harder to remove. After a dust event the pool often needs an unscheduled visit. This is one of several reasons why the annual rhythm of a residence here is not the rhythm it would follow further north, a pattern we set out in more detail in our guide to villa maintenance on the Costa del Sol.
A proper visit is not a net across the surface. It is a short, ordered routine, and it should leave a record. What you should expect from each attendance:
The last two items are where most of the value sits. An unexplained drop in level is the earliest available sign of a leak in the structure or the pipework, and a leak found in week one is a repair. Found in month four it is an excavation. A visit that produces no record produces no early warning, which is why we ask for a short written note after each attendance rather than a monthly invoice with nothing behind it.
Three readings carry most of the risk. Free chlorine is the sanitiser, and if it falls to nothing in warm water the pool can turn green within about forty eight hours. pH governs whether the chlorine works at all, and a pool sitting high on pH can be fully dosed and still cloudy. Alkalinity is the buffer that stops pH swinging, and when it is neglected the pool becomes unstable and expensive to correct.
Beyond the readings, two mistakes are common. The first is shock dosing an unattended pool at long intervals rather than holding a steady level, which stresses the surface and the equipment. The second is topping up with hard mains water without adjusting, which over a season raises calcium and leaves the scale line that owners later mistake for staining. Neither is dramatic. Both are costly to reverse.
The circulation pump is the single component most likely to end a season early. It fails from running dry, from a blocked strainer, from bearing wear that announced itself as a change in noise weeks earlier, and from being run on a timer schedule nobody has revisited since installation. Replacement on the coast is an indication of roughly 400 to 900 euros for the unit and fitting, and actual figures vary by pool size and access.
A sand filter needs its media changed periodically, typically every four to six years, and the sign that it is due is a filter that returns to high pressure quickly after backwashing. A sand change is an indication of around 150 to 300 euros. Deferring it does not save that money, it simply moves the load onto the pump.
Salt systems are common here and they are excellent when maintained, but the cell is a consumable. Cells scale, output falls, and the pool is under-sanitised for weeks before anyone notices, because the system reports that it is running. Cells should be inspected and cleaned on a schedule rather than when the water fails.
Owners arriving from colder countries often want the pool shut down between November and April. On this coast that is usually the wrong instruction. A closed and untreated pool in a mild winter does not stay still, it stagnates, and the spring reopening then costs more than the winter service would have. The water may need replacing entirely, which is neither cheap nor, in a region with periodic drought restrictions, always straightforward.
The better arrangement is reduced winter service. Circulation runs for fewer hours, dosing drops to a maintenance level, visits move to every two weeks, and the pool is kept alive rather than abandoned. It costs a fraction of a spring recovery, and it means the residence is ready when you decide to come, rather than three weeks after you arrive.
Figures on the Costa del Sol move with pool size, water hardness, whether the pool is heated and how much it is used. Treat the following as an indication for a conventional eight by four metre pool, not as a quotation, and expect real outcomes to differ:
Taken together that puts a well-run private pool somewhere in the region of 1,900 to 3,600 euros a year before any major component replacement. A heated pool sits materially higher, and the electricity line is the one most often underestimated, because circulation hours in August are roughly double those in January. It is worth reading that alongside the wider picture in our breakdown of the cost of owning a villa on the Costa del Sol, where the pool is one line among several that behave the same way.
A pool that is only used by your own household is governed largely by common sense. A pool at a residence that is let, even occasionally, is a different matter. Andalusian rules on private tourist accommodation set expectations around safety equipment, signage and the condition in which the property is handed over, and a pool is the most scrutinised element of any inspection. If you let at all, the standards that apply to the water and its surround are worth understanding before a booking rather than after, and we set out the framework in our note on the tourist rental licence in Andalusia.
Regulations differ by municipality and change from time to time. Take the position above as background rather than as advice on your own property, and confirm the current requirements with your own adviser before you rely on them.
Four things account for the large majority of avoidable pool costs. Water level, because a pump that runs dry is a replacement rather than a repair. Timer schedules, because a pool circulating on last winter's hours in July will not hold its chemistry no matter how much chlorine goes in. The plant room, because leaks announce themselves there first and are almost never checked. And supervision, because a pool company that attends without reporting is very difficult to hold to a standard.
There is a fifth, less obvious one. Pool contractors are usually engaged directly by the owner and then left unsupervised for years, which means nobody is comparing what was invoiced with what was actually done. Coordinating and checking that work is part of how we approach estate management generally, and the pool is where the difference shows up soonest. The same principle applies to an empty house, as we describe in our piece on security for an unoccupied property in Spain.
Weekly through the warm months, and every two weeks through winter. On this coast the water rarely gets cold enough to stop biological activity entirely, so monthly service in summer is not sufficient.
It can, but it usually costs more than it saves. Untreated water in a mild winter stagnates, and the reopening may require a full drain and refill rather than a correction.
Almost always because free chlorine has reached zero, or because pH has drifted high enough that the chlorine present cannot work. In water above roughly 28 degrees, that can produce a visible change in about two days.
In peak summer an uncovered pool can lose a centimetre or more of depth per day. Any loss beyond that, or loss that continues in cool weather, should be investigated as a possible leak.
Generally yes, on water, chemicals and heat. It also adds a handling task to every visit, so the arrangement needs to suit how the residence is used rather than being fitted by default.
You are, in practice, unless someone is checking on your behalf. That is the argument for a documented attendance record rather than an unexamined monthly invoice.
A pool rewards consistency more than expenditure. Attended properly it is a modest annual cost with few surprises. Left to run on an unsupervised contract it becomes the most expensive item on a residence, and the failure always arrives in the week before you do.
If you would like to discuss how the pool and grounds at your residence are currently maintained, and what is actually being recorded on your behalf, request a consultation.
