A stupid question regarding protein skimmer

[Myka]

Originally Posted by mrhasan

Yah I do that

BTW did you refer "manual calibration of hydrometer" as checking the reading with freshwater?

No, that is not a good way to do it. A hydrometer should be checked against a calibrated refractometer. If you don't have a refractometer your LFS should be able to check your hydrometer against their own refractometer. Just politely ask when they last calibrated their refractometer before using it to calibrate your hydrometer.