Is your refractometer calibrated? If you use a digital one, do you wait a moment for the temperature to equalize with the glass so the refractometer knows the actual temp of the water it’s testing?Got a weird salinity issue in my tank- over the course of 2-3 weeks, my salinity drops from 1.025 to 1.022 or so. I’ve checked the ATO and it’s not overcompensating, the sensors are also very close so demand is frequent but small and the level in the return chamber is spot on consistent
I skim pretty dry.
Where else can salt go, if it’s not a dilution thing?
No problem on that front. I use a manual and I check calibration once a week, and every time before the last 7-8 readings since I noticed this issue.Is your refractometer calibrated? If you use a digital one, do you wait a moment for the temperature to equalize with the glass so the refractometer knows the actual temp of the water it’s testing?
I’ve scoured every inch of plumbing and put paper towels over every joint to visualize any damp spots, but nothing.Leak from plumbing is possible.
Since switching out the overflow, practically zero. Few grams at most. The change seen would need about 16lbs of salt to come out.How is the salt creep? Eh, it is a big tank, I dont think that would be it.
No on both. I have a peristaltic pump for my ATO and the outlet is 12” above the water surface. It’s never submerged even when my return is off.Is your ATO output ever submerged in the tank water? If so, the salt could be diffusing into your ATO.
Do you have any strong fans blowing on the tank? I suppose it’s possible that there’s some spray from the tank water (ie bubbles popping) that’s getting blown away.