Properly closing your pool for winter is one of the most important things you can do to protect your investment. A thorough winterization prevents freeze damage to plumbing and equipment, reduces algae growth, and makes spring opening significantly easier. In the Midwest, where freezing temperatures are a certainty, skipping this step can lead to thousands of dollars in repairs.
Begin the closing process about a week before you plan to cover the pool. Balance your water chemistry one final time: adjust pH to 7.2–7.6, alkalinity to 80–120 ppm, and calcium hardness to 200–400 ppm. Add a winterizing chemical kit, which typically includes an algaecide, a stain preventer, and a slow-release chlorine floater. These chemicals work together over the winter months to keep the water from turning into a swamp.
Next, lower the water level. For mesh covers, lower it 12–18 inches below the skimmer opening. For solid covers, lower it 3–6 inches below the skimmer. Then thoroughly blow out or vacuum all water from the plumbing lines, pump, filter, heater, and chlorinator. Any water left in the lines can freeze, expand, and crack pipes — the most common and expensive type of winter pool damage. Install winterizing plugs in all return lines and the skimmer.
Remove and store all accessories: ladders, handrails, skimmer baskets, cleaners, and solar covers. Clean the filter one final time — backwash sand filters, clean cartridge elements, or backwash DE filters and recharge with fresh DE. Drain the pump, filter tank, heater, and any other equipment that holds water. Leave drain plugs off during storage so any residual moisture can evaporate.
Finally, install your winter pool cover securely. Whether you use a safety cover with anchors or a standard winter cover with water bags, make sure it's tight and secure. A properly fitted cover keeps out debris, blocks sunlight (which fuels algae), and prevents accidents. Check the cover periodically throughout winter to pump off standing water and remove heavy snow loads. When spring arrives, you'll be glad you took the time to close properly. Need help? DR Installs offers professional pool closing services throughout Indiana, Illinois, and Michigan.
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