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Cheetiah

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  1. I'm a fairly new spa owner (approximately two months). The commonly held rule for spas and hot tubs seems to be to change the water every three months (or more often, depending on who you ask). When I asked my dealer the reason for this I was given a nonsensical answer, so I googled it for myself. Multiple sources have indicated that the reason for this is that the TDS level rises over time. Eventually it gets too high and chlorine is no longer effective; thus, the water must be replaced. This answer made sense and I accepted it for the past month, but I was doing some additional reading on the forums and there were multiple comments that TDS seldom, if ever, contributes to problems with water chemistry. The most common reason necessitating changing the water is actually a buildup of CYA (and less commonly, calcium). Thus the dichlor-then-bleach method of sanitation. This also makes sense and several reputable sources seem to concur with the claim, at least when it comes to pools. So now I'm back to wondering, why does spa water need to be changed every three months? Most of the TDS is sodium chloride anyway, which is intentionally added to SWCG pools and spas. If the water is properly maintained, balanced, and sanitized and the CYA levels don't rise above 20-50 ppm, and the TDS level isn't actually an issue (by itself), what is the reason for changing the water?
  2. I thought I had a good handle on spa water chemistry until I read this article about MPS from the Medina County Health Department: http://www.medinahealth.org/images/company_assets/d98a6e31-3e37-43ff-bc1a-ecc84e8f1117/PotassiumMonopersulfate_b0b9.PDF In particular, this quote has me very confused, "This product is used to eliminate organic contamination. It will NOT remove combined chlorine (CC). Therefore, it is not equivalent to 'Superchlroination'... MPS is mainly used to oxidize organic matter which increases sanitizer efficiency by 'freeing up' more product to be used for disinfection." I thought "oxidizing organic matter" resulting in "freeing up more product" IS the process of removing combined chlorine from the water. Every other description of MPS I've read seems to indicate that it replaces the use of chlorine as an oxidizer, hence the term "non-chlorine shock", which indicates that its purpose is to oxidize chloramines resulting in reduced combined chlorine. Am I missing something or is this article way off the mark when it claims that MPS "will NOT remove combined chlorine?"
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