Pools can’t survive subfreezing temperatures without special preparation. Because ice expands upward and exerts little extra pressure on the sides of an aboveground pool, the water is left in it. The water protects the pool from ground freezes, which can buckle or cave in the sides. Water that seeps under the pool bottom, however, can cause frost heaves that will stretch the liner, ruin the sand filler supporting it and weaken the sides. Check carefully for liner leaks and make permanent repairs before winterizing the pool.

  1. The winterization process begins with a thorough cleaning of the pool.
  2. Test and balance the pool water and then treat it with a chemical winterizing kit, available from a pool store, to maintain the water quality. This is important in preventing corrosion and scale buildup.
  3. Clean the filter.
  4. Drain all the plumbing lines and store hoses in a protected place, such as a garage or shed.
  5. Drain and disassemble the pump and the automatic chemical dispenser.
  6. Drain the filter, filter valves and the line to the gauge. Be sure to store the pump, filter, and chemical dispenser in a warm, dry garage or basement.
  7. Shut down or disconnect all the electrical lines.
  8. Finally, cover the pool.
Pool cleaning equipment
Mark Winfrey/Shutterstock
A thorough cleaning is the first step in winterizing an aboveground pool.