Water top off rate

[dean]

I'm designing an automatic water top off device to feed my sump as the water level decreases. My tank is "test" mode and I'm noticing only a pint of so loss per day with all pumps running (55 gallon tank). How frequently are other folks needing to top off. Dean

 

[chuck]

I have a 110 and I replace about 2 gallons every 3 days.

 

[krazzydart]

I have a 120 and only use about 1/2 gal a week .... depends on the cover you have and the humidity in the house and water temp........