A stupid question regarding protein skimmer

[mrhasan]

Yah I do that

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

Originally Posted by Myka

Just check your salinity. If you find the salinity has gone up by 0.001 add some freshwater. Make sure you are using a hydrometer that has been manually calibrated or a refractometer that you calibrated a few times per year.