I am alittle unclear as to your system of adding water to your tank. Is this for water changes, or top-off or both?
If you are taking actual water from your saltwater tank and adding it to salt, then mixing it and putting it back into your tank, you will end up with a high salinity level. It is like adding saltwater to replace water that has evaporated from your tank, instead of just fresh water!!!
Maybe I am not following your lead. Please help me to be able to help you better, if i am not following you!
Thanks,
tom _________ 125gal.w/Mag9.5 return(dual megaflow)>Mag7 pump Aqua Cev180skimmer.Wave2k Hamilton Reefstar(2)250watthqi(mh)pend.a Yellow, Naso Tang Red Lip Blenny Percula Clown Demoiselles Niger Trigger F. Wrasses Ceriantharia Orn.Shrimp and Stars Hermits Queen Conch asst. snails> Stars Zoos shrooms Montipora Brains Gorgonians Favia Turbinaria(large+small polyp) Acropora Xenia Tridacna (CroceaMaximaSquamosa) Leathers <35+75gal.reef tank as well> 
"IF THE PHONE DOESN'T RING...IT'S ME"  jb  |