Flush the antifreeze. Inspect everything. Hit the road right. Total time: 5–7 hours (2–3 hours active).
De-winterizing is faster than winterizing but more consequential if you skip steps. The most common spring mistake is turning on the water pump before reconnecting the water heater bypass — which fills your water heater with antifreeze-contaminated water you then have to flush repeatedly. This checklist walks you through startup in the order that prevents that.
⏱ Plan this for the day before your first trip, not the morning of. The water sanitation soak takes 4–8 hours unattended. Start early, let it soak through the day, flush in the evening. First trip the next day.
⚠ Flush All Antifreeze Before Sanitizing
Antifreeze and bleach together can produce chlorine gas. Flush antifreeze out completely before adding any bleach solution. Don't rush this step.
Anode Rod: Inspect Every Spring — Replace Every 1–3 Years: The anode rod is a sacrificial magnesium rod that corrodes so your water heater tank doesn't. When it's 50% gone or the steel core wire is exposed, replace it now. Cost: $10–18.
Bleach Formula
Use PLAIN unscented household bleach (sodium hypochlorite, 6–8.25%). Ratio: ¼ cup of bleach per 15 gallons of tank capacity. Always pre-dilute in a gallon of water before adding to tank — never pour bleach directly in.
⏱ Soak: 4–8 Hours Minimum — Overnight Is Better. Let the bleach solution sit in the full system for at least 4 hours. Do not use any water during the soak. Set a timer and walk away.
Expect 2–3 Full Tank Flushes to Clear the Bleach. The water must smell and taste neutral before it is safe to drink.
Sanitize your fresh water system every spring. Flush with a diluted bleach solution (1/4 cup per 15 gallons), let it sit for 4 hours, then flush until you can't smell chlorine. A tank that's been sitting for 5 months needs it.
Test your LP detector, CO detector, and smoke alarm before your first trip of the season. Press the test button and confirm each one is loud — not just illuminated.
Walk every roof seal and seam before your first trip. Freeze-thaw cycles open up seams that looked solid in October. Five minutes on a roof walk can prevent a multi-thousand dollar interior water damage claim.
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