[Johnny Reefer]

Originally Posted by TheReefGeek

.....The salinity swings without auto-top off of 10% evaporation per day must be pretty significant?

This is what I expected when I first got into Marine aquarium keeping, without an auto top-off, 1 1/2 years ago. But, IME, 10% evaporation caused an increase of only about 0.001 - 0.002 SG.

Cheers,