Eco One is an enzyme system that works as a bacteriacide. Â There is a similar system, The Natural, that is sold and explained at rhtubs.com. Â There are users of these systems that swear by them. Â They tend to be very easy on the skin. Â They should be used with a low dose of chlorine, though many don't but this would be risky, IMO, because these are not sanitizers. Â Like ozone, silver, copper, etc., Â they do help but tend to be expensive and are not magic cures that eliminate the need for a registered sanitizer.