I don't think I have these. If I did, they've since turned in to more test vials.. smhI don’t know about the phosphorous, but the phosphate has these samples that you use to check the validity of your tester…View attachment 205513
There just full of redacted and unredacted sample to give your meter a reading…but it’s all +/-I don't think I have these. If I did, they've since turned in to more test vials.. smh
Didn't even think of that. Ha! good idea!A cheaper thing you could do is just to take out a liter of your tank water, spike it with your phosphate additive to 10ppb or so, and then measure that. If it gets that right, then I think your hanna is working fine.
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