The poolife NST Prime tablets are an excellent product to sanitize your pool in an easy way without overstabilizing the water. These slow dissolving cal-hypo tablets are designed to be able to be used with the poolife NST Feeder or in a skimmer. Not only will this chlorine tablet sanitize your pool by destroying bacteria and organic contaminants, but it will not lose chlorine due to overstabilzation from cyanuric acid. The NST Prime Tablets are compatible with chlorine, salt chlorine generators, ozone and mineral systems. Use these convenient tablets to help keep your pool water as clean and safe as possible.