Frozen pool equipment can crack pumps, filters, heaters, and plumbing lines, leading to expensive repairs or complete replacements. A cracked pump housing can cost $500-800 to replace, while frozen plumbing lines often require excavation and professional repair that runs into thousands. Proper winterization prevents these problems by removing all water from equipment and plumbing systems. This includes draining the pump, filter, heater, and blowing out all underground lines to ensure no water remains that could freeze and expand. The cost of professional pool closing is a fraction of what you’d pay to repair or replace frozen equipment. In Lloyd Harbor’s climate, proper winterization isn’t optional – it’s essential protection for your pool investment.