If you can handle a little fluctuation in your water level (up to an inch) I've been using the Tsunami AT1 for 7 years never had a problem. Actually never even clean it.
The SpectraPure version says it only varies the level 1/4".
They get pretty good reviews on R/C.
Tsunami AT-1 and SpectraPure controller both use air pressure to activate and deactivate an outlet.
Just don't trust the suction cups, I made a mount from a MJ bracket.
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Brian
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220g inwall 48"x36"x30"
110g mangrove refug/sump
Poison Dart Frog Vivarium
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