When Should You Close Your Pool? Keep Your Water Healthy For The Next Season

Last Updated on March 8, 2021 by

Different factors dictate when to close your pools, including foliage in the pool and the water temperature. However, the best time to close your pool is when the temperature falls below 60-degrees. At such a temperature, microorganisms and algae won’t grow, and they will become dormant for the winter season.

Decreased algae growth in your pool helps to reduce problems when you reopen it in the spring. Closing your pool when it is still warm will deplete the chemicals you add to it before spring. Pool chemicals are used up fast during hotter temperatures than when it is cold. 

Closing your pool earlier than the temperature allows will also make it susceptible to staining and algae growth during early spring. Closing early may also lengthen the cleanup time and spring opening since the water will be unsanitary.

What You Need To Know Before Closing Your Pool

Closing your pool needs proper preparation and a good knowledge of how to balance the chemicals. You will also need to dedicate a full day to this process as improper closing will cause issues when opening it. Here’ what you need to know;

1. Ensure that the mechanical systems are prepared properly for freezing temperatures. Remove any standing water from heaters, pumps, and plumbing lines and secure a good pool cover.

2. Do not empty your pool for the winter. Doing this may cause the soil around and under the pool to freeze, expand, and eventually move your pool out of place. You can drain your pool 4-inches to 6-inches below the skimmer.

3. Winterize your pool properly to minimize the chances of piping and equipment from freezing. Doing this will minimize repairs and extended delays when clearing your water for reopening your pool.

4. Add shock to your pool two times during the offseason to keep the water clear until you reopen in the spring. You can do this around Easter and Thanksgiving since the water will still be thawed, and the chemicals will get in without resting on top of the ice.

5. Have a professional to test your water so you can put the right chemicals in the correct amount. 

You can close your pool by yourself if you have proper instructions but make sure to follow them correctly. Following the right procedures makes it easy for closing and opening your pool at the right time. 

What Happens To Your Pool If You Don’t Winterize It?

Although it may be tempting not to close your pool as summer comes to an end and winter sets in, it is important to note that closing your pool will save you money and also keep the structure intact. 

Here’s what to expect if you are skeptical about closing your pool;

1. Algae Infestation

Failing to close your pool during winter may cause algae infestation if your chlorine system fails. The growth of algae in your pool can destroy your pretty blue water leading to an expensive and unsightly cleanup.

Algae can be an eyesore, and getting rid of it may be quite draining to your wallet. When you want to use your pool again, you may have to drain the water fully and replace it, which could be expensive.

Algae may not be a health hazard, but the bacteria that feed on it could cause rashes, gastrointestinal illnesses, ear, and respiratory infections to the swimmer. You will, therefore, have to clean your pool regularly.

2. Pool Falling Apart

Your in-ground pool is covered by a liner that prevents the water from damaging its foundation. If the liner’s surface gets cracks, it can be detrimental. When you close your pool and inspect it regularly, you will assess any damages during summer and solve the issues on time. You will also reduce the risks brought about by extreme winter conditions that may lead to cracking.  

If, on the other hand, you don’t close your pool, the water will freeze when the temperature drops. The freezing temperatures and ice can rip open the cracks or expand the existing ones.  

3. Additional Cost

If you leave your pool open during winter, you will have to run your pumps to prevent freezing that may cause structural damages.  You will use a lot of electric energy to keep your pumps running hence additional cost. 

Your filter and plumbing system could also freeze and cause the water temperature to drop significantly and shut off your chlorine systems. All these factors will lead to extra cost for repairing your pool when spring finally comes.

Is It Okay To Shock Your Pool Before Closing?

Shocking your pool kills bacteria that might thrive during winter. You can carry out the procedure a few days before shutting the pool or on the night before you close it for winter.

Essential Tips To Close A Pool In Winter.

Although winterizing your pool may seem complicated, you can make it a pain-free and simple process with a little preparation.

1. Winterize One Week Before Closing

Add a phosphate remover to your pool one week before closing to prevent any potential algae infestation. Ensure that you don’t shut down before the temperatures drop below 60-degrees. 

2. Vacuum And Brush

Ensure that you clean your pool thoroughly before closing for an easier opening during spring. Ensure also that you brush the floor and sides, skim the surface and clean out your pump baskets and skimmer after vacuuming.

3. Control The Water Level

Your water level should range from 4-6 inches below for the freezing area, and the skimmer should be vinyl-lined and tile line should be plaster.

4. Shocking Your Pool

You should add chlorine or non-chlorine chemicals to destroy algae, bacteria, and chloramines that may thrive during winter. You can either shock a few days or the night before closing your pool.

5. Balance The Pool’s pH

Use a test kit to measure your pool’s chemistry. Ensure that the total alkalinity lies between 80 and 120 ppm, and its pH level is 7.4-7.6. 

6. Drain Pool Lines

Ensure that the pool filter, heater, pump, and other equipment are drained before closing. You should also add antifreeze for freezing temperatures to prevent repairs that result from damaged pipes. 

Remove filter cartridges and DE grids from the pool and clean them fully. You can use a vac-liner to blow any remaining air out of the filter and pump. Store the drain plugs in a pump basket during winter to prevent any potential damage.

7. Use Air Pillow

Use an air pump to inflate an air pillow in the middle of the pool and tether it to an anchor to keep it in place. You can also use a pillow pal to create a lock between the bottom of your winter cover and the air pillow.

8. Secure Your Pool

Protect your pool with a secure cover that is tightly sealed. There are various covers that you can use for this purpose, namely;

9. Winter Covers 

These covers do not protect pets or people from falling into the water as they are not sealed across the pool. You can use a mesh winter cover to protect your pool from debris while at the same time letting water to filter through the material. This process helps to alleviate any heavyweight caused by freezing or standing water.  

You can also use solid winter covers to give a more sturdy seal and prevent debris from entering your pool. You may, however, need a cover pump to drain water throughout the winter.

a) Safety Covers

Safety covers offer the greatest level of protection against any unwanted substances such as winter storm debris. The covers are usually anchored onto the surrounding deck

B) Pool Leaf Nets

These covers are typically used in areas that have a mild climate. They are mesh pool covers that let water pass through while at the same time blocking huge debris. The covers prevent acorns and leaves from getting into the pool. 

9. Monitor Chemical Balance

Use a test kit to regularly check the water chemistry or consult a service technician if the chemicals are unbalanced. Ensure that the water has the correct pH at all times.

Is It Okay To Close A Green Pool?

Closing a green pool or one filled with debris could permanently damage or stain the surfaces. Protect your pool with balanced and clean pool water, a strong cover, and a winter kit. If you close your pool green with algae, unbalanced water, or dirty with debris, it will cause staining and saturation of water with dead algae cells, which may lead to more algae growth.

Final Word

If you close your pool during winter, it will save you a lot your time, money, and labor when the spring comes. It will prevent damages such as cracks or staining the walls and surfaces, which may require a lot of repair work before opening.

Ensure that you shock and monitor the water chemistry to keep algae growth under control.

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