Winterising your pool

Read here how to prepare your swimming pool for the winter

Before the winter...
At the end of the swimming season, we advise you to follow these guidelines in order to get your pool ready for the winter.

Do not remove all water from your pool nor remove your liner. An empty swimming pool could collapse.…

What do you do with your swimming pool when the season comes to an end? No doubt you check the pool and the installation. Is everything still working the way it should? No leaks? Have all leaves been removed from your pool? In the autumn you have ample opportunity to (let) check and maintain your installation.

Do you have a summer blanket or (automatic) roll deck? Remove the autumn leaves, rinse the summer blanket or roll deck with clean tap water, so that all chlorine residues are gone. Leave the summer blanket to dry and store it in plastic. Cover your pool with a winter net, to keep your pool free of leaves. The roll deck has to be clean before you roll it. Make sure the roll deck remains under the water line at all times.

Vacuum the dirt from the bottom of your pool and pump the waste water (preferably directly) into the sewer system. Backwash your filter for at least 10 minutes.

It goes without saying that you make sure your pool installation is frost free. This will prevent parts and pipes from freezing. All water in parts that are above the frost line (less than about 70 cm below ground level) and in the filter system, should be drained away. Drain the pool itself until skimmers and injectors/jets are free above the water level. Remove a possible filthy edge (at the waterline) with a special (foil) cleaner.

ATTENTION, at all times check the level of local groundwater and its effect on your pool. When you have a steel pool with a foil liner, keep the water in the pool at least 20 cm above groundwater level.

Drain the tubes of your pool. Shut the skimmers and injectors/jets off with plugs. The water which stays in the pool will stand still for at least six months. It is worth the effort to take good care of your water now, this will save you a lot of extra work in the spring.

Then you drain the water from pump and filter. Leave the valves open. Put the multiport valve in open position (intermediate position) and remove the cover. Pump and fi lter sand can dry. Filter sand older than 5 years should be replaced.

If you have an horizontally placed pressure gauge, turn it loose and let the water run out to avoid freezing. Also drain tubes where water can remain behind. This also goes for heating pipes and solar heating systems. Leave the valves open.

The best way to keep the water remaining in the pool in condition is to use an anti-algae winterising agent. This is a special agent that prevents the forming of algae in the winter.

You can intercept expansion by ice forming through floaters. These are placed in a diagonal line in the pool to prevent ice floes from damaging your pool.

Check the water level of your pool on a regular basis during the winter. Much rain may cause the water level to rise again. Drain off excess water into the sewer system with a submersible pump. Never smash the ice. It could damage your pool.

Store your stock of water treatment products in a dry, safe and frost free place.

We like to give you the following advices:

Check all screws and joints

  • Make sure that all joints and parts of the construction are still in place and that the pool side did not move from the bottom rails.
  • Make sure all joints are watertight.

Check for rust

  • If there are any damages or rust spots, treat them with a lacquer pin or other rust defending product.

Check the liner

  • Convince yourself that the top of the liner still fits over the pool side with the plastic frame. Do not remove the liner from your pool. Removing the liner from your pool will cease the warranty’s validity! Do not drain all water from your pool before the winter.


  • Make sure there are no leakages in the liner. Any leakage in the winter may cause serious damage to your pool.

Swimming pool accessories

  • Remove all accessories from your pool, including the ladder. Do not remove the skimmer and return fitting. If necessary, fi ll the skimmer with pieces of styrofoam to prevent freezing.

Winterising fluid

  • This product can be used in combination with chlorines without any problems. If there already are algae, give the water a shock treatment fi rst. The agent, solved in a bucket of water, has to be equally spread over the water surface. Let the pump run during the dosage. Dosage: 0,5 litre per 10m³ pool water, after about 4 weeks 0,3 litre per 10m³.
  • Never mix the agent with other (pool) chemicals! Always add the agent to the water, never the other way around.

If you do not winterise your pool according to these guidelines, the warranty of your pool may expire.

These guidelines are just an advice. No legal rights can be derived from them. Because of the various kinds of pools, various constructions and installations it is impossible for us to give an exact advice for all situations. The required procedure may differ form the advice. From experience and consultation with your supplier, you will discover the best procedure for your swimming pool.

Warning: Make sure that children cannot get in touch with your pool chemicals. Strictly follow the regulations on the packaging. Never mix two different brands or kinds of chemicals, certainly not in a bucket. Prefarably store them separately as well!