Nature2 Zodiac A30 W28165 Aboveground Mineral Cartridge Sanitizer 30K Gallon

This Above Ground Pool Mineral Cartridge by Nature 2 is perfect for keeping your pool water clean and safe this season. Made for 5,000 to 30,000 gallon pools, this replacement mineral cartridge is for all above ground A vessels (except Nature2 Limited) and has a daily run time of 6 hours. This above ground pool mineral cartridge destroys bacteria and controls algae by using natural minerals, so you won't have to worry about stinging eyes, skin irritation and unpleasant odors. Plus, it helps to stabilize pH levels without harming your pool equipment or staining your pool.