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Old 04-29-2010, 02:51 PM   #11
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Also make sure your sump can hold the extra water in case of power outage and have a battery backup air pump.
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Old 04-29-2010, 09:08 PM   #12
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you could compare an auto top off unit to the float in a toilet... it shuts it off when the bowl is full, opens the valve when you flush...
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Old 04-29-2010, 09:24 PM   #13
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There is also a fail-safe way of setting it up where you will have very little chance of overflow... if a diagram is needed let me know.
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Old 04-30-2010, 12:31 AM   #14
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I would highly recommend using a dual float with solenoid for your ATO. The float are too risky, IMO.

I have this in my sump and it is very sensitive to level changes and it works flawlessly.With 2 floats and the solenoid it is near impossible to have a flood. Plus, if the power goes out, it turns the feed off.
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Old 04-30-2010, 01:15 AM   #15
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Okay this is what I was saying... and sorry for the lame "paint" diagram it's just all I could do in 5 min
the 1 is the running water level (your level may be more or less a percentage of the tank)... when power is shut off your tank will be full. The top of the top-up tank is no higher than the sump/refugium if the Float valve fails (non electric) then it may cause your salinity to drop but it will not over flow... if the power fails and the float is working then it would be the same as no auto top-up was installed... the only way to get an overflow with this system is if the float fails till the water is level with the other one and then starts to work again (preventing back feeding) and then the power goes out. The biggest downside to this setup is you still need to top-up the top-up tank... but it would maintain a stable tank with no change in salinity and the top-ups could be a week between.

P.S. I'm a bit of a scatter brain in the evening I get up early. Sorry for the confusing post.
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