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Thanks for the additional information!

When my CYA was up in the 3 digits, I would usually take a cup of pool water and a cup of tap water (or three cups when i was diluting 3:1) and mix them, then I put that diluted mixture into the test container up to the mark. This was easier to get the ratio dilutions I was looking for. My CYA...

After doing these tests by hand for the entire last season I cannot wait for mine to show up soon. Whatever kit you choose definitely get this!