BioGuard Arctic Blue Winter Closing Kit - up to 24K Gallons BioGuard Arctic Blue Winter Kit (24K) up to 24K Gallons of Pool Water Each kit contains 1 Arctic Blue Algae Protector, 2 Arctic Blue Shock and winterizing insturctions Using the Arctic Blue Winter Kit in the off-season will make opening in the spring much easier. Simple easy to use swimming pool winterizing kit BioGuard Winterizing Kit 24,000 Gallons