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I figured it out. It’s definitely me messing with the filter compartments. I keep messing with the configuration and the water level will rise in the filter compartments. I will pull out a couple 40 ml scoops and dump to get the water level where I want it. Then the ATO tops off with fresh. I didn’t know removing SW would lower salinity if I use ATO. Figured taking sw out, then letting ATO top off at new level wouldn’t raise salinity.Skimming wet removes the volume of saltwater that is your skimmer cup every time you do it. If your saltwater isn't being replaced, and instead you're just allowing the ATO to add RO to replace the lost saltwater, then you're definitely lowering the salinity gradually over time.
I do agree with @Cell though, we don't have enough information here to help you make informed decisions.
How (and how often) are you testing salinity? Hydrometer, Refractometer, Conductivity Probe?
Over what period is the Salinity dropping? Daily? Weekly? Monthly?
How (and how often) are you calibrating your chosen Salinity tester?
Is your tank temperature stable (within 1 degree in either direction)?
The answers to the above questions will give us a more detailed picture.
How big is your tank? How frequently do you have to refill your ATO? How are you measuring salinity?This is the second time my salinity has dropped from 1.025 to 1.022. Is it my ato!? I do skim wet and dump my cup often. Could this be the problem?
26 gallon AIO - measure with refactor every other day. I go through about 4 gallons a week of RO.How big is your tank? How frequently do you have to refill your ATO? How are you measuring salinity?
I calibrate it every time I check. LFS also confirmed.Your refractometer could be off
yeah. I have to calibrate every time I use it.Your refractometer could be off
Yes, but shouldn’t salinity stay the same if I remove two quarts and move the sensor to the new level?Whenever saltwater is manually removed and is replaced by freshwater, you are lowering salinity. You are removing water+salt and replacing it with just water.
ATO is used to replace saltwater that has evaporated, water evaporates but the salt stays behind in this case, which concentrates salt content increasing salinity until an equal amt of freshwater is added.