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winterizing pool

Chemical Guide for Closing My Swimming Pool

27,Sep 2018
With summer coming to an end, Pittsburgh swimming pool owners will be preparing to close their pools up for the winter. It’s time to check your stock of pool closing supplies such as winter chemicals, plugs, pool cover attachments, and other accessories used for winterizing your pool, to make sure you are adequately prepared.

At Swimming Pool Discounters, we have put together a guide to help you navigate the chemicals needed for winterizing swimming pool to help you keep your water clear while preventing scale and stains on your pool.

Most Common Pool Chemicals for Winterizing


Water balance chemicals used to adjust the pH, alkalinity, or calcium hardness of the pool, are a common chemical used in the winterization process. It is recommended that you also use other winterizing chemicals including:

  • Pool Shock (Chlorine Free). The granular oxidizer in the shock helps to remove impurities and contaminants that could consume the winter chemicals or stain your pool.
  • Stain & Scale Treatment. This treatment helps to prevent metals from oxidizing and staining the pool surface. It also keeps salts and calcium from mixing with containments and forming dirty scale. This also helps prevent the winter bathtub rings commonly found in pools after they are opened.
  • Winter Floater.  This device will slowly release a non-chlorine sanitizer and will not stain or bleach your pool steps or liner.
  • Winter Algaecide.  This long-lasting treatment works with the floater and pool shock, helping to eliminate algae growth while your pool is closed.

How to Use Winterizing Pool Chemicals


Once you’ve cleaned the pool and the filter, it’s time to lower the pool’s water level. It is recommended to reduce the water level several inches below the tile line and skimmer. After you have dropped the water level, you can begin adding the chemicals. Follow this timeline for the best results:

Add in the pool shock two days before you close the pool and then add the stain and scale treatment one day before you close the pool. Right before covering the pool, add the winter algaecide and the winter floater to the water.

You may also consider using Pool Anti-Freeze to prevent your pool plumbing pipes and skimmers from freezing. This antifreeze can also be used to protect against leaky plugs. Do not use pool antifreeze in a pool heater, filter, chlorinator, or pump, remove the drain plugs for each instead to prevent freezing.

Pool enzymes can also be used in addition to these winterizing chemicals to help break down oily contaminants that can consume winter algaecide or lead to stains.

Winter Pool Care Tips

Once you’ve added your winterizing chemicals and have covered your pool, you should be able to put pool maintenance aside until the spring. Most of the time there is no need to check the water chemistry during the winter unless the pool has new whitecoat or plaster which could cause a rise in the pH level.

It is essential to make sure the cover fits correctly and doesn’t allow sun or dust in. Also, be sure to take care of issues such as algae before closing the pool. This will help eliminate the need for adding additional pool chemicals during the winter.

Two to four weeks before reopening the pool, pull back the cover and check for issues that may require the need for additional chemicals to prepare the pool to be opened.

Contact the experts at Swimming Pool Discounters today to learn more about winterizing your pool and take advantage of our wide selection of winterizing chemicals and accessories to get your pool ready for the winter season!