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So that you can enjoy your pool 100% all summer, it is essential to carry out an operation: wintering. This keeps the facilities and the quality of the water in good condition throughout the cold season. There are two methods: passive wintering or active wintering. Which solution to choose? How to do? How do you put a swimming pool in winter? The answers are to read below...

The wintering of a swimming pool

The wintering of a swimming pool

Take care of your pool in winter

The wintering of a swimming pool can begin as soon as the temperature of the water passes constantly below 12° C. All outdoor pools that can not be disassembled must winter except inflatable pools, indoor pools or freestanding pools.

Why put a pool in winter? There are two main advantages:
1- Protect equipment and structure of the pool (liner, piping, skimmer, pump...)
2- Avoid finding a green pool water when the good weather returns.

Passive or active wintering?

There are two wintering processes for a pool:

1- The total wintering also says passive wintering: the swimming pool filtration is stopped

This process, recommended in very cold regions, consists of completely stopping the filtration and treatment of water. The steps are:

  • shock treatment with chlorine or PHMB to eliminate bacteria and algae
  • cleaning the bottom and walls of the pond as well as pool equipment using a hand brush or pool cleaner robot
  • lower the water level (about 10 cm below the discharge nozzles)
  • drain the equipment to evacuate the water and stop the filtration (pump, filter, skimmer...)
  • protect the filtration apparatus from cold and frost
  • pay a wintering product to limit the deposit of scale and bacteria on the walls
  • plug the bottom drains, the brush sockets and the discharge nozzles
  • place wintering floats on the water and gizmos in the baskets of the skimmers (plastic float) to protect it from frost
  • cover your pool with a winter cover or roller shutter to prevent leaves and other debris from settling on the surface of the water.

2- Active wintering: swimming pool filtration is idling

This solution is ideal in the south of France where the temperatures are a little softer. Water filtration is idling, on average 2 hours a day. An anti-freeze system triggers the filtration at a certain temperature level defined in advance. This process is less restrictive than passive overwintering. The steps are as follows:

  • pour wintering product at the beginning of winter and repeat the process several times
  • control the pH some water regularly
  • open the skimmers and run the pump from time to time to avoid freezing
  • place a wintering cover to protect the pond from impurities

Active wintering allows a quick restart of the pool when the weather is nice.

The 5 tips and mistakes not to do:
1- Warning, contrary to popular belief, it is not advisable to drain the pool entirely because the weight of the water keeps the liner at the bottom of the pool.
2- The bubble cover is a summer cover not suitable for winter. You have to choose a special cover, called winter cover, a shutter or a tarpaulin.
3- Before wintering a swimming pool, the water must be clean. The walls, the bottom, the pump, the filter, the skimmer baskets must be cleaned thoroughly.
4- Use a wintering product to stop the proliferation of bacteria, algae and deposition of limestone. Be careful, because the wintering product is not antifreeze.
5- If a layer of gel forms, do not break it because it could tear the liner.


Video Instruction: Winterizing the In Ground Pool