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How-to Pool Closing: How to Close Your Pool

How to Close Your Inground Pool in the North

There are certain steps to take when it comes to closing inground pools in colder climates that are determined by where you live. For inground pools in colder climates, follow these simple instructions to ensure an easy pool opening next season with less mess to deal with and less time spent cleaning before you can jump in and start enjoying the water. Check out our Pool Pro instructions below on how to complete inground pool closings before the colder weather hits your area.


As the temperatures begin to drop, the ground beneath your pool will start to rise and if the pool is empty, it could potentially pop out of the ground. Without anything to hold it down, you could be looking at costly damage when you open your pool next spring.

1. Clean Around the Pool. Be sure your entire pool area is free of dirt, debris, leaves, branches and other harmful materials that could blow in and change the chemistry of your pool water.

2. Check All Equipment. Check your pool cover and pool equipment for small cracks, tears and other signs of damage. If you notice your liner or cover is somehow damaged, don’t panic, as Doheny’s has a wide selection of pool covers and pool cover repair kits. If you notice your plumbing lines, filters, or heaters have issues we have a selection of replacement parts and accessories as well.

3. Cleaning Pool Walls & Floor. Scrub, clean, and wash your pool walls and floor thoroughly using an easy to maneuver automatic pool cleaners or a powerful hand held pool vacuums.

4. Add Winter Chemicals. Before your pool is fully winterized, the pool chemicals must be balanced. Test the water, the pool pH and alkalinity levels. We recommend 24 hours in advance to take full effect. Follow up with Doheny’s Winter Pool Closing Kit, which contains algaecide, metal out and pool shock.

5. Run the Pool Filtration System. Your pool’s filtration system is the lifeforce that keeps your pool water healthy and clean. Make sure that it’s clean, well taken care of, and running properly before opening season next year. Let your filtration system run until the water is completely clean, repeating the cycle as necessary.

6. Lower the Water Level. Read the manufacturer’s recommendations for lowering the water level in your pool during the winter. Make sure it reaches about two inches beneath the surface of the skimmer or the lowest plastic fitting. This prevents freezing and expansion when the temperatures in your area start to drop. A skimmer plug can be a huge help in keeping water out and is an affordable solution.

7. Cleaning Pool Filters. For D.E filters, flush out the D.E. and thoroughly clean out the grid. For cartridge filters, make sure to clean the cartridge and the inside of the tank. For sand filters, run an extra-long backwash, cleaning the sand completely. After the pool filter is clean, disconnect all the PVC pipe fittings and remove the drain plugs from the pump, filter, and heater to make sure no excess water is trapped. To prevent permanent damage from freezing temperatures, properly store your filter and other pool equipment in a safe and dry place for the winter.

8. Add Antifreeze. For your PVC pipes, per the pool’s specifications, blow out all plumbing lines. Once this has been completed, consider using pool antifreeze to prevent any residual water from freezing and cracking the pipes.

9. Use a Pool Tablet Dispenser. If you want additional sanitation for your water, apply our winter oxidizing tablet into the water supply. Let it take care of the dirty work for you - you won’t regret it next year.

10.Skim It! Skim Insure is a great application for your pool’s skimmer. It cleans and makes sure that freezing and potentially expanding water won’t damage the pool.

11.Store all Pool Accessories Remove all inground pool accessories from the area, including pool steps, ladders, diving boards and pool slides. Store them in a cool, dry, place to keep them safe for next year.

12.Installing Winter Pool Covers. Now is the time to install winter pool covers. Read the directions carefully, and spread the entire cover evenly over the pool’s surface. If you happen to live in an area with occasional bad weather, consider using pool water bags or aqua blocks to weigh down your cover. Fill them with approximately ½ to ¾ full of water to allow expansion during below freezing temps.

13.Add a Winter Pill. The Winter Pill will prep your water supply the minute you drop it in, helping keep it clean all season long. The Winter Pill can be used with other pool closing products as well.

14.Keep the Area Clean All Season Long. Keep track of the condition of your winter cover throughout the winter season and keep snow, ice, and other debris away from the area. Regularly check for cracks or tears in the cover, as these can quickly ruin a good pool cover.