How to Winterize a Pool Sand Filter for Pool Closing

After you’ve invested a handsome amount in pool equipment, you don’t want to freeze them. This is why a pool filter must be properly winterized when it’s not in use during winters. This ensures that your filter is maintained properly and works flawlessly.

Apart from the filter, you need to drain hoses, water pumps and store them. A lot of sand filters come with a built-in winterize setting which you can use if you’re not planning to use it for a time span of a year.

In this article, I’ll explain why you need to winterize your pool, how to winterize sand filter, along with some handy tips you can use.

Why You Need to Winterize Your Pool ?

Maintaining a pool needs a lot of investment. You need to close your pool properly in the winters to prevent potential damage to your expensive pool equipment and to prevent freezes.

If you’ve got vinyl liners, they can be torn apart by surface freezes due to ice expansion. Another reason why you’d want to winterize your pool is that a pool left UN-maintained in winters, you’ll have algae, chemical, and bacterial residue build up over the period of several months.

Needless to mention, these problems can be quite expensive to fix. Also, fixing your pool is the last thing you want to deal with once the weather is nice and you need to open your pool again.

Winterizing a sand filter is a process of back-washing, and removing the residue.

Note: Check your filter’s owner’s manual for any specific or special instructions for your model.

Suggested Reading : Best Pool Filters

How to Winterize a Pool Sand Filter

Step 1  Use the water pump and control lever to backwash and rinse out the filter. Once water is running clear via the nozzle, shut it down and switch on the winterize setting on top of the filter. Turn your valve to rinse position for 30 seconds after the backwash for optimal output.


Step 2  Once you are done with backwash and rinsing process. Put your valve on winterizing setting from top of mount valve. Turning on winterize setting allows water to drain via the valve.

Step 3 Next up, you’ll need to disconnect your inlet hose from water pump. Do this by removing the hose clamp and then sliding off the end of the spout. You also need to disconnect the inlet hose from the water pump. Plug one of these hoses to the inlet nozzle from skimmer outlet.


Step 4  Your next task is draining all the water from the filter tank. Unscrew and remove the drain cap ( it’s placed on the bottom of filter barrel ).  Note: Keep your cap stored in a safe place. You do not want to lose it when you need to open the pool again. Also, don’t bother to remove the sand from the filter. The filter system is good to go for up to 5 years.

Step 5 Take off the pressure valve from the top of the filter to ensure it doesn’t get damaged in winters.

Step 6 Drain all unused hoses. Disconnect them and place the water pump, sand filter, drain cap, hoses, and pressure value in a safe, and dry place. Store in until the pool is ready to open again.

Suggested Reading : How to Maintain a Salt Pool

Handy Tips from Experience

  • Wait until your pool’s temperature gets at 60 degrees and stays there for a while. This helps when you open it in spring. I’ve tested this in western suburbs. The result was opening clear and balanced every time.
  • If your pipes can be disconnected without damage, take them off and cover holes with a sheet of plastic. Hold the plastic in place using ring clamps.
  • A lot of people wonder what does the winterize setting on mount valve do. It actually allows water to drain from the valve.

Conclusion :

I can’t count how many clients I’ve had that spent a lot of money on repairs that they didn’t need to. Remember, precaution is better than cure. If you have any hacks or personal tips, drop them in comments below.

Author: Jack Iglesias

I am Jack Iglesias, the brain behind this blog. By profession, I am a pool heater and pump repairman. After being around heaters and pumps for so long, I started to consult people who wanted to build the pool for themselves.

Leave a Comment