Our winters are getting colder and for longer periods of time. It was only 2 years ago we had -10 degrees Celsius for an entire week and last year we had a long cold snap. So, how do you close a pool? You have 3 options for winterising your pool. I tend to recommend option one (1), lower the pool a significant amount so rain fill will not be an issue (If you have a water table around your pool do not lower it too much). You can then forget about the pool until next year and you are not using any electricity. If you have an automatic safety cover that is also your winter cover, you need to go with the option two (2) or three (3). If you have a very high water table I recommend that you also stick with 2 or 3 also. If you are unsure then call your pool man. ( I obviously recommend this being a local pool man!) Not winterising the pool properly can cost a lot of money. Boiler heat exchangers alone can set you back several hundred let alone having to find a leak under ground or replace the skimmers.

Full Shut Down

  • Lower the pools water level below the skimmers allowing some space for rainfall to fill before it fills the skimmers and pipework.
  • If you have a solar cover or heat retention cover, once it had been rolled up, lift one end up to allow the water that is stored in it to drain out.
  • Disconnect and drain all equipment and pipe work that may store water. If there are sections of pipework you can not drain, have a union fitted to allow drainage. Don’t forget your boiler heat exchanger or low pressure hot water (LPHW) system. (The new Certikin Genie boiler has antifreeze in its LPHW system so does not need draining)
  • Fit a winter cover, shock dose the water and add a good winter chemical. This is not essential but will make the next years start up much easier.
  • If this rain keeps falling remember to take some extra water out to keep the level down during the frosty months.


  • As Full Shut Down options for 1, 2 & 4.
  • Have a frost thermostat fitted by a qualified electrician so that the circulating pump automatically turns on when the temperature drops to freezing point.
  • Drain your boilers LPHW system if it has one.
  • Backwash the system every now and again to maintain a normal running level.

Manual frost protection

  • As Frostat option′s 1,3 & 4
  • Set your time clock for a few hours a night during the coldest period. Water takes a while to freeze so does not need to be on as soon as it gets cold. I normally go for between midnight and 4.
  • If we get any periods of extended cold weather place the circulating pump onto constant.


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