Water loss / evap?

[Indymann99]

+1 high humidity = mold... not good.

I keep a humidity meter in the basement to keep tabs on the level

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[PatW]

I would suggest installing an auto top off in your last sump chamber. You can buy an ATO from autotopoff.com for a pretty low price and pick up a pump also.

 

[RV7AFlyer]

My 400 gallon system evaporated 13-15 gallons a day. I have a lot of surface turbulance though.