Your pool in winter
Winterising isn’t abandoning. Apply the 8 steps one by one, then compare what happens to the pool when the frost arrives, with and without winterising.
End of season
The pool, ready to sleep
When the water stays below about 15 °C and the pool won’t be used, it’s time to winterise. In southern Madrid that’s usually between late October and November. Press “Start” and apply the 8 steps, in order.
- Frost can crack pipes and skimmers if water is left standing inside.
- Water with no treatment or circulation is the perfect breeding ground for algae.
- Without filtration, dirt settles on the floor and can stain or damage the lining.
- An electrical panel left unprotected from damp is an almost certain fault at the next start-up.
- Deep clean: floor, walls and waterline. Start the winter with as little organic matter as possible.
- Final shock treatment. Leaves the water as “neutralised” as possible against algae and bacteria.
- Balance pH and alkalinity before closing. Unbalanced water degrades the lining for months.
- Lower the level below skimmers and inlets. Stops ice from cracking them.
- Drain and purge the pump, filter and pipes. The water left inside is what freezes and breaks parts.
- Floats or antifreeze in lines that can’t be fully drained. They absorb the expansion of the ice.
- Cover with a winter cover, firmly anchored. Less dirt and less sunlight, which helps algae less.
- Protect the electrical panel from damp. Prevents corrosion faults over the winter.
The order matters: if you lower the level and drain the pipes before the shock treatment, it’s harder for the product to reach every corner of the pool.
What about emptying it completely? As a rule, no: the weight of the water helps the pool shell hold its position against the pressure of the ground. It’s only emptied if building work requires it.
Would you rather we winterised it?
We do the full winterising with a checklist, and the start-up in spring.