Top up system

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I've been using one of these Blue Line Tsunami AT1's for 4 years with no problem. I have it connected to a maxi-jet and it works great. It works by air pressure so there are no moving parts or floats to maintain.

It does take almost an inch of water drop in the tank or sump to activate it so it might not be sensitive enough for a small tank. And don't forget an anti-siphon hole if your output from the maxijet is below the surface or lower than your reservoir.

If you have a water filter you can run it's output to a float valve in the freshwater container.

Hope this helps.