How to winterise your swimming pool

Imagotipo Piscimar

Winterizing your pool is key to keeping the water clean, extending the life of the equipment, and avoiding surprises in spring. 

In this guide we explain step by step how to winter your pool in winter, how many hours the purifier should work, how to keep the water even without covering it and what products you need for effective maintenance. 

Ideal for owners who want to take care of their pool all year round with minimal effort.

Person removing leaves from a swimming pool in winter with a leaf skimmer; the blue cover is partially rolled up and the edge of the pool is covered with frost.

What is pool winterization and why is it essential in winter?

Winterizing a pool in winter is an essential process to keep the water in good condition during the cold months, prevent damage to the filtration system and reduce the consumption of chemical products. Even if you don't use the pool at this time, you shouldn't neglect it.

An unmaintained pool in winter can become a hotbed of algae, bad odors, and costly repairs.

How to maintain a pool in winter step by step

1. Pre-cleaning and pH adjustment

Before starting winterizing, perform a deep cleaning of the glass, check the pH level (ideal: 7.2–7.6) and make sure that the alkalinity is balanced. This will make maintenance easier throughout the winter.

2. Use of specific products for wintering

It uses liquid winterizing products from Piscimar that prevent the proliferation of algae and bacteria. They are essential to keep the pool water crystal clear in winter without the need for replacements in spring.

Can you keep a pool uncovered in winter?

Yes, it is possible, although it requires more attention. If you decide to keep the pool uncovered in winter, make sure to:

  • Regularly clean leaves and insects that fall into the water.
  • Check chlorine and pH levels weekly to maintain chemical balance.
  • Add winterizing product every 6–8 weeks to keep the water in good condition.
  • Visually monitor algae formation and apply a winter-specific algaecide if you detect any signs of greenery or turbidity.

Although keeping the pool without a thermal blanket is viable, it requires more vigilance. Using the right products and maintaining a basic maintenance routine is key to avoiding major problems.

How many hours should the treatment plant operate in winter?

One of the most common doubts is how many hours to put the treatment plant in winter. Although the water temperature drops, it is recommended to run the treatment plant for 1 to 2 hours a day, preferably in the warmer hours.

This minimal operation prevents water stagnation and protects the pump and filter.

Final Tips for Maintaining Pool Water in Winter

  • Check the water level: it should not drop too low to avoid frost damage.
  • Use floats or special rubber bands to prevent ice from damaging the walls.
  • Do not completely empty the pool.
  • Install a winter cover if you want to minimize maintenance.

And what products do we recommend at Piscimar?

  • Long-lasting winterizing product.
  • Specific anti-algae for winter.
  • pH and chlorine analysis kit.
  • Floats and thermal or safety covers.
Other articles
Our latest news
in your inbox

Basic information on data protectionYour data will be incorporated into the processing for which it is Responsible: BONET ESPECIALITATS HIDROQUIMIQUES, S.L.U.; Purpose: Purpose 1: To respond to your enquiry; Purpose 2: To send commercial communications, including by email or equivalent electronic means, if you give us your consent. Rights: You have the right to access, rectify, and delete your data, as well as other rights, as indicated in the Further information and detailed information on Data Protection, which you can consult on our website: www.behqsl.com/en/privacypolicy/contacts/

¿Problems in your swimming pool?
Professor Piscimar will answer any question you ask him. Go ahead, press the button.

Hemos recibido tu mensaje.

¡Gracias por confiar en Piscimar!

Teacher Piscimar:
Do you have a problem with your pool?
I'd be happy to answer you if you tell me!
What is your name?
What do you want to ask?
Do you know these values ​​for your pool?
You need to have your water analyzed for these parameters in order to give you a solution.

Basic information on data protectionYour data will be incorporated into the processing for which it is Responsible: BONET ESPECIALITATS HIDROQUIMIQUES, S.L.U.; Purpose: Purpose 1: To respond to your enquiry; Purpose 2: To send commercial communications, including by email or equivalent electronic means, if you give us your consent. Rights: You have the right to access, rectify, and delete your data, as well as other rights, as indicated in the Further information and detailed information on Data Protection, which you can consult on our website: www.behqsl.com/en/privacypolicy/contacts/

Ideal values
for each parameter
Phosphates
Alkalinity
pH
Calcium hardness
Free chlorine
Combined chlorine
Stabilizer
Bromine
Iron
Copper
Nitrates
0 ppb
100 ppm
7,2
300 ppm
1,5 ppm
<0,6 ppm
25 ppm
3 ppm
0 ppm
<0,6 ppm
0 ppm

Perfect swimming pools with