Advice Please: Who runs cannister filters on their Reef and other things

[Skimmerking]

Originally Posted by globaldesigns

Kevin sells a solution, that gives you the calibration points for many things... Salinity, MG, Calcium and so forth... Salinity, I believe it will give a true reading of 35, so I put a few drops on the refractometer and reset it to a true 35 reading... Good stuff!!!

Distilled RO/DI water will do the same thing let it sit stale for 1 day in a glass.

[Slick Fork]

Originally Posted by Skimmer King

Distilled RO/DI water will do the same thing let it sit stale for 1 day in a glass.

That's good for zeroing it, but there are a lot of refractometers that don't scale properly which is why I've always seen it recommended that you calibrate it at 35