Pool Opening on the Costa del Sol: A Practical Guide
August 2026
What needs to happen before your pool is ready for summer
Most pools on the Costa del Sol sit partially or fully closed through winter. By March, the water is cold, the chemistry has drifted, and the pump has not run at full load for months. By May, the temperature climbs fast. A pool that was fine in October is not automatically fine in May, and owners who arrive in June expecting clear water are often met with something considerably greener.
Pool opening on the Costa del Sol is not complicated, but it does require doing several things in the right order. Skip one step and the rest of the work becomes less effective. This guide walks through what a proper pre-summer preparation involves, what happens when it gets skipped, and how to manage the whole thing if you are not yet in Spain.
| Task | Why it matters | When to do it |
|---|---|---|
| Remove and inspect winter cover | Debris under a damaged cover contaminates the water immediately | First step, before anything else |
| Check pump and filter operation | A pump that seized or a cracked filter housing over winter will undermine every chemical treatment | Before adding any chemicals |
| Clean or backwash the filter | A clogged filter cannot process the shock treatment effectively | After confirming the pump runs |
| Test water balance: pH, chlorine, alkalinity | pH outside the 7.2-7.6 range makes chlorine far less active, so shock treatment is wasted on unbalanced water | After the filter is clean and running |
| Shock treatment (if needed) | Kills algae and oxidises winter build-up; requires balanced pH first | After water balance is corrected |
| Vacuum floor and brush walls | Removes settled debris the filter cannot reach | After 24-48 hours of filter run post-shock |
| Inspect fittings and surrounds | Winter temperature swings can crack grout, fittings, and skimmer baskets | At any point during the visit |
The two failures that cost the most
Skipping water balance before the shock dose
Pool shock (a high dose of chlorine) is the standard way to recover a pool that has gone cloudy or green over winter. The problem is that shock only works properly when pH is in range. If the water is too alkaline (pH above 7.8, which is common after a long shutdown), the free chlorine from the shock becomes far less effective. Owners sometimes wonder why they add chemicals and nothing changes. Usually, the water balance was not corrected first.
Adjusting pH takes time and re-testing. A crew that arrives, tips in chemicals, and leaves without waiting for the filter to circulate and then retesting is not completing the job. A proper opening takes a few hours at minimum, not thirty minutes.
Ignoring the pump and filter
The filter is what clears the water after a shock treatment. A filter with clogged media or a pump that is not drawing properly will leave the pool looking murky for days even when the chemistry is correct. Before winter, pump seals can dry out; filter sand compacts; cartridges lose their shape. The opening service should confirm both are working at full flow before any chemical work starts.
A pump that fails mid-summer on the Costa del Sol is an expensive fix under pressure, because every pool company is fully booked from July onwards. Catching a weak motor or a cracked housing in April is a different situation entirely.
A pool left unbalanced through the early summer weeks will turn green. Shocking it back costs more than the visits that would have kept it clear.
What summer actually does to a Costa del Sol pool
The coast gets intense sun from May through October. UV degrades free chlorine faster than most owners expect. In August, an outdoor pool in direct sun can lose most of its free chlorine in a matter of hours, which is why weekly servicing is the minimum during peak summer rather than a conservative upsell.
Heat also accelerates algae growth. A pool that looks fine on Monday can have a visible green tint by Friday if the chlorine drops below effective levels and the water temperature is above 28C. Once algae establishes on the walls and floor, brushing and chemical treatment has to work harder, and the filter runs longer.
Swimming load matters too. A pool used daily by a rental property processes more contamination (sunscreen, body oils, nitrogen compounds) than a pool used occasionally. These compounds consume chlorine and raise chloramine levels, which cause the familiar eye irritation and smell that people wrongly associate with too much chlorine. The smell usually means there is not enough free chlorine, not too much.
This is why the frequency question has a clear answer for this coast: weekly during summer, fortnightly in spring and autumn. Not because service companies want more visits, but because the climate makes lower frequency unreliable.
| Period | Recommended frequency | Primary focus |
|---|---|---|
| March to May | Fortnightly (plus one full opening service) | Opening checks, balance correction, filter inspection |
| June to September | Weekly | Chlorine levels, algae prevention, skimmer and filter cleaning |
| October to November | Fortnightly | Chemistry management, preparing for reduced use |
| December to February | Monthly or covered shutdown | Cover checks, minimal chemical maintenance, pump run time |
Managing the opening from another country
This is where most owners abroad run into practical problems. The pool needs to be opened in April or early May. The owner arrives in June. Who does it, who confirms it was done properly, and what happens if something is wrong?
The traditional approach is to call a local pool company, hope they show up, and take their word for it. Owners who have done this for years know the result is inconsistent. Sometimes it is fine. Sometimes the crew came for twenty minutes, added chlorine to green water, and left a report that says "water treated."
What a properly documented service looks like is different. Before photos show the condition of the water and equipment at the start. After photos show it running clear and the readings. A written report in your language states what was done, what the readings were before and after adjustment, and any observations about the pump, fittings, or surrounds. You can review all of that from a phone in Helsinki or London and know whether the work was actually done.
If the property is currently empty and the owner has no one local with a key, a keyholding service solves the access problem. The crew collects the key from the keyholder rather than needing the owner present. The visit happens, the documentation lands in the app, and the owner approves and pays remotely.
If the pool opening reveals a problem that needs a follow-up trade (a failed pump motor, cracked tiles, a filtration system that needs replacing), Property Coordination means the owner does not have to find a specialist separately or manage the scheduling themselves. SolidMaint handles the sequencing and communication. The owner approves and pays through the same platform.
You can see how the pool maintenance service works, or check current pricing if cost is the first question.
Green pool recovery: what it involves
If the pool has gone green over winter, it is not necessarily a write-off. Full draining is rarely the first step and is usually unnecessary unless the water has been neglected for a very long time or there is visible sludge the filter cannot process.
The recovery sequence for a moderately green pool is: correct pH first, run a heavy shock dose, run the filter continuously (often 24 hours), brush the walls and floor to disturb algae from surfaces, then retest after 48 hours. The water should clear to blue-green within a few days, then to clear with continued normal maintenance.
Two things go wrong when owners try to handle this without professional help. First, they add shock to water with high pH and see no improvement, then add more, which wastes chemicals and does not fix the problem. Second, they do not run the filter long enough after treatment. A filter running eight hours a day is not enough when recovering a heavily contaminated pool.
A crew that knows the process will handle the sequencing correctly. The key is that they return to retest and confirm the recovery is working, not just treat and leave.
One thing worth doing before booking
Before the crew arrives, check whether you know the pool's volume and the filter type (sand, cartridge, or diatomaceous earth). This information affects the chemical doses used and whether the filter needs a specific cleaning product. If you do not have it, a good crew member will assess on-site, but having it available saves time. It is also worth storing this in the property's maintenance record so the next service does not start from zero.