Is Pink Prime Guard Antifreeze Safe To Leave In The Lines All Winter Without Draining Til Spring?
Published 10/20/2025
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Question:
Is the pink Prime Guard safe to leave in the lines all winter without draining before spring?
asked by: Scott
Expert Reply:
Yes, Scott, that’s exactly what it’s made for. All three Prime Guard formulas are non-toxic and won’t damage plumbing if left in place for the off-season. Just remember to flush with fresh water before first use.
That said, I strongly recommend going with the glycerin-free options like -50F # PG36ZR and -100F # PG96ZR since they actually help lubricate seals, making them last longer than using budget-friendly ethanol-based antifreeze like -50F # PG56ZR.
Do you sanitize with bleach or something else after winter when spring rolls around?
Product Page this Question was Asked From
Prime Guard Glycerin Free RV & Marine Antifreeze -50°F Burst Protection - 1 Gal - 6 Jugs
- RV Fresh Water
- Winterize
- Antifreeze
- Prime Guard
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Scott
10/20/2025
usually just flush everything with fresh water in spring, but I’ve never actually sanitized it. Is that something I should be doing every year too?