A neglected pool has a way of sneaking up on you. One rainy Cape Town winter, a holiday away, or a season of load-shedding that keeps the pump off, and suddenly the water is green, the walls are slippery, and you are not sure whether to call a professional or reach for the net. The good news is that most abandoned pools can be brought back to life without starting from scratch. The trick is working in the right order and knowing which problems are cosmetic and which are structural.
Assess Before You Act
Before you touch a single chemical, walk around the pool and take stock. A green pool is usually just an algae problem, which is very fixable. But look deeper: are there visible cracks in the shell, is the water level dropping on its own, or has the surface become rough and chalky? These signs point to issues that go beyond water chemistry. Taking photos now also gives you a useful before-and-after record if you decide to bring in a specialist.
Should You Drain It?
Draining feels like the obvious first move, but it is often the wrong one. In Cape Town’s clay-heavy soils, an empty pool can lift or crack because of ground water pressure, especially after winter rain. Draining also wastes a precious resource in a water-scarce region. In most cases you are better off treating the water in place. Only consider a full drain when the water is beyond recovery, when total dissolved solids are extremely high, or when the surface needs repair work that cannot be done underwater.
Getting the Water Back Under Control
Once you have decided to treat rather than drain, the process is methodical. Rushing it usually means cloudy water and wasted chemicals.
- Remove leaves, debris and any obvious sludge from the floor with a net and manual vacuum.
- Balance the pH first, because chlorine works poorly in unbalanced water.
- Shock the pool with a strong dose of chlorine to kill algae and bacteria.
- Run the filter continuously for several days, backwashing as pressure builds.
- Add a clarifier or flocculant to gather fine particles so the filter can catch them.
- Brush the walls and floor daily to lift clinging algae into the water where the chemicals can reach it.
Patience is key. A badly neglected pool can take a week or more of filtering and brushing before the water turns from swamp green to crystal clear. If your pump or filter has been standing idle, check that it is actually working before you rely on it.
Dealing with the Surface
Once the water clears, the true condition of the interior finish becomes visible, and this is where many restorations move from cleaning to renovation. Run your hand along the walls. If the surface is smooth and intact, a good acid wash and polish may be all it needs. But if it feels gritty, is stained beyond cleaning, or is flaking away, the finish has reached the end of its life.
When Cleaning Is Not Enough
A rough or failing surface is not just an eyesore. It harbours algae in every pore, which means you will fight the same green battle again and again no matter how much chlorine you add. At this point resurfacing becomes the smart long-term choice. Marbelite pool resurfacing gives an older concrete shell a fresh, hard-wearing finish that is far easier to keep clean. For owners who want the lowest-maintenance result, a fibreglass pool lining creates a smooth, non-porous shell that resists algae and sealing problems for years.
Knowing When to Renovate
There is a point where patching and treating simply costs more time and money than a proper renovation. If you are repeatedly repairing the same cracks, if the surface has been resurfaced several times already, or if the pool leaks despite balanced water, it is worth getting a professional opinion rather than throwing more chemicals at it. A restored shell also protects the value of your property, which matters in Cape Town’s competitive housing market.
Restoring a neglected pool is genuinely rewarding, and much of the early work is well within reach of a determined owner. The judgement call comes when cleaning stops being enough and the structure itself needs attention. If you have reached that stage, or you simply want an expert eye on the shell before you invest more effort, the team at Aquatic Pools can assess the condition and recommend the right path. Reach out through the contact page to arrange a visit and get your pool swim-ready again.
