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Message: [QUOTE="crsublette, post: 180540, member: 3847"] Yeah, the WRPH tester is really more used to determine if you should use the LRPH or the HRPH since these two testers will give you a more accurate reading at a particular range. For your KH and GH questions, check out the thread, [URL="https://www.gardenpondforum.com/topic/12301-proper-kh-and-gh-levels/"]proper KH and GH levels[/URL]. Rock salt, that is sodium chloride, will not help to lower your pH. For folk not good with acronyms: WRPH - Wide range pH LRPH - low range pH HRPH - high range pH [/QUOTE]