Well according to the documentation the Hanna unit checks for a type of phosphate that the chemical kits don't detect. I took that to be marketing BS.
Well to be on the safe side I changed out my rowaphos and put a phosphate filter pad in my sump. Put in approx. 150ml of new rowaphos but it didn't drop the level over night.
I am dubious about the accuracy of the meter though. Need to find a reference test fluid for it.
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I have to go out and buy more snails for my hermit crabs.
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