I've got it. Evaporation is seen in the return section of the sump.
Set an ATO to replenish fresh water into that area for evaporation level with a drain hole.
This would keep your salinity the same and your tank filled to the proper level. Any excess (from pumping in fresh salt water) will be above and beyond the proper level and will result in water being released out the drain hole.
Ta Da.....
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150 gal Custom. Born 5/7/07. 50gal, 29gal, 20gal Sumps. 30gal Frag Tank. ETSS 800 Skimmer, Deltec APF600 Skimmer. PFO Solaris Lighting on Display and Frag Tank
My Tank Thread
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