I have a float on my reservoir. I think I paid $6. Just go to your local farm supply store, like Cenex or others. and tell them you have a trough in your barn that you need on an automatic fillup. For me, I just drilled a 3/4" hole near where I wanted the water level, mount the float and then you can hook up a garden hose to it.

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SpaceNeedle Reviewed by SpaceNeedle on . Idea: Is it mine? Auto fill reservior using tiolet tank float? Has anyone ever thought of using a toilet tank float to auto fill your DWC reservoir? I've searched the threads and haven't found anything. Rating: 5