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I’m thinking I’m ok and just dropped by a 10th. Meaning I could drop 4 more 10th’s until I hit the 0.5 max.??

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I think your way over thinking it.
Assuming all the numbers you posted are in ppm then, you dropped 0.11 ppm. You started at 0.33 ppm .... you can only drop 0.33 ppm then you are at zero..... it's not possible for you to drop 0.5 ppm (same as 0.50 ppm) since you only have 0.33 there to begin with.
Just remember to write in that zero and it all make sense.

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I know what you mean so I stopped doing the math and now just use the chart where it already converted for you. One less step to mess up at.
Hanna ULR Phosphorus Checker ppb to ppm phosphate conversion chart

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Chart shows 74ppb to convert to .227 ppm. So you could round up to .23 or just drop the last digit and call it .22 . Remember that .22 and .220 is the same number.

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Originally Posted by
Fish Keeper82
Chart shows 74ppb to convert to .227 ppm. So you could round up to .23 or just drop the last digit and call it .22 . Remember that .22 and .220 is the same number.
Thx! Makes it a lot easier.
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