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Do not, under any circumstances, use Trichlor (the tablet form of Chlorine). It will damage your cover, pillows, shaft seals in the pumps, and may cause damage to the shell finish if the floater settles in the same spot - which is exactly what they tend to do.
I'm new to the hot tub world and might be buying mine later today actually, but while doing my checking and such, a good friend of mine in WA who is a bit of a health nut and into natural stuff, recommended I look at Spa Magic products for my tub. He told me Bromine (and other related products) have actual warnings on them about not getting into contact with your skin, eyes, etc. and that it and other toxic chemicals contain pesticides. Starting new, I'm going to try to go the natural product route, prefer this than having my family sit in toxic water. Just FYI.J
It seems the local retailers by me are clueless about other alternatives; if using Spa Magic or other related more natural products allow you to minimize the amount of other chemicals you put in your hot tub, why not consider it then? Seems there isn't much to lose if it gets the job done.
Here are two other product lines, yes, some over the top hype and such on the sites, but some valid points too and I wonder if anyone on this forum has used this stuff, or that Spa Magic, etc. and have been happy with the results...http://www.clarityforspas.com/index.htmhttp://thenaturalspa.com/J
Not to insult his buddy but he is one of the many "natural" type people we have living in Washington