Adjusting Salinity Levels

WhatCouldGoWrong71 · Dec 7, 2025

Hey all - I had to adjust my salinity and I went a little too far. I’m sitting at 1.0265/35.2 and if I wanted to get it to 1.0257/34.3ish. I’m probably splitting hairs but…

I’m sitting at 550g system volume. I do AWC so I can adjust what I pull out to be greater then what salt water I put back in, thus my ATO would fill in the delta. Can someone help me with a formula to determine how much rodi I would need to add to bring my value down? My thoughts are I would take that value and create a delta in my AWC schedule over a couple days then restore my AWC’s 10% standard schedule.

Bruttall · Dec 7, 2025

I have about 340g total water volume in mine. If it was me, not saying you should, but I would take 2 gallons water out, let the ATO top it off, check salinity, repeat every 12 hours till you get the level you want.

I adjust my salinity like this occasionally, a gallon at a time on my system.

With that large of water volume you won't "shock" the inhabitants IMO.

Randy Holmes-Farley · Dec 7, 2025

WhatCouldGoWrong71 said:
Hey all - I had to adjust my salinity and I went a little too far. I’m sitting at 1.0265/35.2 and if I wanted to get it to 1.0257/34.3ish. I’m probably splitting hairs but…

I’m sitting at 550g system volume. I do AWC so I can adjust what I pull out to be greater then what salt water I put back in, thus my ATO would fill in the delta. Can someone help me with a formula to determine how much rodi I would need to add to bring my value down? My thoughts are I would take that value and create a delta in my AWC schedule over a couple days then restore my AWC’s 10% standard schedule.

If you put no salt in the AWC water, then allowing it to change 16.6 gallons, sg will drop from 1.0265 to 1.0257.