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If you have a tub with an ozonator installed and, if you have some "clear" tubing downstream of the Mazzei injector site, take a look at the tubing after a few weeks or months of use - most likely it will be reddish colored. Vermonter
So, what about the claims of Nature2, ozone and MPS being a sanitizing system using chlorine only at start up? Now EPA registered.
For illustrative purposes in this highly informative post.Terminator