Hanna Colorimeters

[Magickiwi]

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.