Spa Marvel is working great for me. My water feels great, smells great and looks great. All while using very little chlorine. Many reviewers imply that the only thing they are using in their tub is Spa Marvel and their water is great. Howerver, this is NOT the correct way to use it. Spa Marvel is NOT a sanitizer and will not kill bacteria in the tub. It is an enzyme that breaks down the things bacteria feed on, but that's it. So it must be used with a sanitizer of some sort, be it bromine or chlorine, to kill any bacteria that are in the tub. That said, I maintain my tub with anywhere from 0.5 to 1ppm of dichlor (chlorine) and the water is wonderful with Spa Marvel. This compared to the 3 to 5 ppm of dichlor that is recommended for traditional use. No harsh chemical smells, no itchiness, no feeling like you have to take a shower when you get out of the tub. The pH stays balanced, the TA stays balanced. This stuff is for real, but you must use it along with a sanitizer in order for it to work properly.

Kevin -

This is just a short term rating so far. First the tub is a Canadian Spa Co. Swift Current portable spa that is inside a insulated spa house in the yard so is covered all the time. Second only my wife and I use it mainly me on the really cold days in Winter we are in Canada. The tub we have has a recirculating filter pump that runs 24/7 is very energy efficient and filters the water continually. I bought extra filters and change them every Sunday. I normally use the spa once a day for 30 minutes and sometimes twice. We use only bathing suits that have not been washed with any kind of detergent just hot water. I was using firstly Chlorine then switched to bromine sanitation but both times bad skin rashes showed up plus the ph and the alkalinity and hardness and sanitizer levels were all over the place. Switched to Spa Marvel 5 weeks ago and only use non chlorine shock every Sunday after filter change and 1 small Bromine puck in floater at the same time. Result , rash gone, beautiful crystal clear water with the ph and other test levels stable with no messing around with other chemicals. The water feels soft on the skin no prickly feeling and there is absolutely no smell. Like I said only 5 weeks in but so far love this product it is working for my situation don't know how it would work in a party spa situation. I will report in another couple of months in how it is working out but right now I love this product.

Leslie -

Great produce supper vendor.

Cliff -