Balance Chemical Levels

• The first step in winterizing your pool is to ensure that all of the water's chemical levels are properly balanced. Test the levels and make sure the pH is between 7.2 and 7.8. The total alkalinity should fall in the 80 to 150 parts per million (PPM) range, while the calcium hardness should be between 180 and 220 PPM. Add a chlorine or nonchlorine shock agent to the pool for sanitizing purposes, and wait for the chlorine level to fall back within the 1.0 to 3.0 PPM range.
  
  

Remove Debris

• Remove all debris from the pool. If necessary, vacuum the floor, and use a skimmer or leaf net to remove floating items. Clean the surface of the walls and floor with a stiff-bristle brush to ensure that no residue or dirt is present.
  
  

Lower Water

• Using the filter pump, lower the pool's water level to approximately 2 inches below the lowest return line. If your pool is lined with tile along the edge, make sure the water line falls below the bottom of the tile. In a vinyl-lined pool, it is not necessary to lower the water.
  
  

Remove Fittings and Accessories

• Remove all of the pool's fittings, such as wall fittings, skimmer baskets, cleaners and lights. Pool accessories should be removed as well, including the ladder and diving board. Store all of these items inside for the winter to protect them from the elements.
  
  

Drain Pump and Filter

• The pool's pump, chlorinator, filter and heater must be drained of water for the winter. These pieces are equipped with drain plugs that allow for easy drainage. If any water is left inside these items, they may freeze and crack when the temperature drops. A small pump and filter may be stored indoors for the winter. Otherwise, use a compressor or shop vacuum to make sure that all the water is blown out of the equipment.
  
  

Blow Out Lines

• In an in-ground pool, the plumbing lines must also be blown out for the winter. Use a vacuum blower for the job, and finish by placing expansion plugs on the lines. If you do not want to blow out the plumbing, add an antifreeze product to the line. With an above-ground pool, simply detach the hoses that connect to the filter and pump, and add plugs to the outlets.
  
  

Add Winterizing Chemicals

• Before covering the pool, add a winterizing chemical kit to the water. These kits typically include an algaecide, a shock agent and a rust and scale prevention product. When adding the chemicals, do not add the algaecide and shock at the same time because the chlorine in the shock may prevent the algaecide from working properly.
  
  

Install Cover

• The final step in the winterizing process is to install your pool's cover. Make sure it fits tightly and that there are no holes or damage in the surface material where debris may enter. For an in-ground cover, use some type of water bags to secure the cover in place. An above-ground pool cover is usually secured with cables.