Reef Angel Forum

I really like the water level expansion for making sure my sump never runs low. I've calibrated the down tube several times and can't seem to get it dialed in correctly. The problem is that whenever the sensor trips at the low level, the ATO pump kicks in just long enough to raise the level above the minimum. A few minutes later, the level is low again, and the cycle repeats. What % values do most folks use for the MIN and MAX% levels when programming the module?

What are your MIN and MAX settings?

You should have at least a 4% spread between the MIN and MAX levels.

My low is 32% and my high is 36%.

So when it goes below 32% it will run the ATO until it gets above 36%.