Spa Perfect is a patented natural enzyme & botanical extract formula that is specifically formulated for hot water temperatures. Spa Perfect powerfully, yet gently biodegrades body oils, cosmetics, suntan oils & other non-living organics. No more waterline rings, clogged filters or cloudy, smelly water. Spa Perfect is also a continuous cartridge filter cleaner. Since oils & non-living organics don't build up, soaking with nasty chemicals & acids is rarely required.