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I tried Kent and stopped because the kh was so high. I started using Tropic Marin Pro-Reef because it's one of the few I found with a kh that I could raise to my desired level vs. lowering it with muriatic acid. I also used IO and IO Reef prior to that. The kh is too high on them too but not as bad as Kent. I like the TM but it is expensive.
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