Pools in winter: close it down or keep it running?
Both routes are valid, but one needs attention and the other discipline. The wrong route is the third one: doing nothing.
This is the first question once the season ends. It has a clear answer: both routes are valid, but there is no third one. Leaving the pool to itself is not an option.
Route 1: Keep it running
If you want the pool to look right through winter as well, the system has to run for set periods and maintenance has to continue. Algae grows slowly in cold water, so filtration hours can be shorter than in summer and chemical consumption falls. The advantage of this route is that the pool is ready to use at the start of the season.
If you take this route, managing the freezing risk is essential. Water standing in the pipes and the pump expands when it freezes and cracks the equipment. On nights when the temperature drops below zero, either the system has to be running or the lines have to be drained.
Route 2: Put it into winter mode
The water level is lowered below a set point, the lines are drained, the equipment is protected and the pool is covered. This route needs less attention but requires an opening service at the start of the season.
The cover does two jobs here: it keeps leaves and dust out of the water, and by blocking sunlight it slows algae growth. A pool closed without a cover has not really been closed.
The wrong third route
A pool left untouched all winter stays dirty and may need a deep clean at the start of the season. That usually costs more than a whole winter of regular maintenance: draining the water completely, cleaning the shell mechanically, sometimes overhauling the tile joints.
There is also unseen damage. Sediment and algae formed in water left dirty for a long time settle into the joints and the shell surface. Repeating that every year shortens the life of the pool.
Which suits you
If you see the pool in winter — a living room facing the garden, a terrace, a hotel operation — keeping it running makes sense. If the pool is neither used nor seen in winter, winter mode is more economical.
Both share one point: the decision should be made in autumn. Switching to winter mode after the frosts have started means the equipment has already been at risk.
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