A pond tester is one of those things that every pond owner has to buy. Why? Because it's one of those things that seems necessary. After all the internet says to test your water. Then add things to change whatever your test kit is telling you. The problem is that koi are carp and so are goldfish and carp do just fine when you leave them alone. Save your money because after the first few times testing the water you'll won't be concerned enough to get the kit out.
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