Ultimate Guide to Winterizing Your Fiberglass Pool

Ultimate Guide to Winterizing Your Fiberglass Pool

December 13, 2023

Newly,Installed,Swimming,Pool,In,Spring,With,Unfinished,,Back,YardWinter is fast approaching, and if you are a proud owner of a fiberglass pool, it is important to ensure that it is properly winterized to prevent any potential damage caused by freezing temperatures. Winterizing your fiberglass pool not only protects it from the harsh impact of winter weather but also makes the process of reopening it in the spring much easier. In this ultimate guide, we will take you through the step-by-step process of winterizing your fiberglass pool, ensuring its longevity and functionality for many years to come.

1. Clean and Balance the Water

Before you begin the winterizing process, it is important to thoroughly clean your pool. Remove any debris, leaves, or other organic matter that might have accumulated in the pool. This will prevent any chemicals from reacting with the contaminants and potentially damaging the pool’s surface.

Once the pool is clean, test the water and adjust the chemicals accordingly to ensure the balance is correct. Proper water balance is essential to prevent the growth of algae and other microorganisms that can damage the pool during the winter season.

2. Lower the Water Level

To prevent potential damage caused by freezing water, it is important to lower the water level in your pool. Use a submersible pump or siphon hose to drain the water to the appropriate level, usually recommended by the pool manufacturer or a professional. This helps to ensure that expanding ice does not cause any damage to the pool’s structure or equipment.

3. Winterize the Plumbing

One of the most critical steps in winterizing your fiberglass pool is to take care of the plumbing system. Begin by backwashing and cleaning out the filter system. Remove and clean any cartridge filters or grids, as necessary. This helps maintain the efficiency of the system and extends its lifespan.

Next, blow out the plumbing lines using a compressor or shop vac to remove any water. This prevents freezing and potential damage to the plumbing during the winter. It is important to start with the furthest return line from the pump and work your way back, ensuring all water is removed.

4. Protect the Equipment

To ensure that your pool equipment remains in optimal condition during the winter, it is essential to protect it from freezing temperatures. Remove any exposed hoses, skimmer baskets, or other equipment that could be damaged by freezing water. Store these items in a safe and dry place until the pool is ready to be reopened in the spring.

If possible, disconnect and drain the pump, filter, and heater. For added protection, consider covering the equipment with a waterproof cover to prevent any moisture from seeping in.

5. Install Winterization Accessories

To provide an extra layer of protection for your fiberglass pool during the winter, consider installing winterization accessories such as a pool cover and winter plugs. A pool cover helps to prevent debris from entering the pool while also retaining heat and preventing water evaporation. A winter plug, on the other hand, seals off the skimmer and return lines to prevent any water from entering and damaging the plumbing system.

6. Regular Maintenance Throughout Winter

Although your pool may be winterized, it is important to conduct regular maintenance throughout the winter season. Check the pool cover regularly to remove any accumulated debris or excess water. This prevents the cover from sagging and potentially damaging the pool.

Additionally, periodically check the water chemistry to ensure that it remains balanced. Although minimal, some chemical adjustments may be necessary due to natural evaporation or other factors.

7. Reopening the Pool

When the winter subsides and warmer weather arrives, it’s time to reopen your fiberglass pool. Begin by removing the pool cover carefully, ensuring that no debris falls into the pool. Thoroughly clean the pool and refill it to the appropriate water level.

Inspect the equipment and plumbing system to ensure that everything is in proper working order. Make any necessary repairs or replacements before starting up the pool for the season.


Winterizing your fiberglass pool is an essential step to protect its structure, equipment, and plumbing system from potential damage caused by freezing temperatures. By following this ultimate guide, you can ensure that your pool remains in optimal condition throughout the winter season and is ready for use when warmer weather returns.

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