water topoff

[mike31154]

Gravity feed with a mechanical float valve is the simplest, if you have the room to hide the container, or if having it visible above the sump is not a problem. As far as the size of the top off container, the only caution I would add is, if there's any kind of shut off valve failure, you run the risk of dumping too much fresh water into your system too quickly. Since you only lose 3-4 gal per week, I'd say a 5 gal container would be a good starting point.