I bought this and used it with Tom's aqualifter pump, and I have it fill into the return chamber of my sump.
The only problem so far has not been with the Hydor ATO itself, but the pump. Even at 3gph, it's too strong, so by the time the ATO sensor switches the pump off, it's already overfilled and the alarm goes off. I just put the little valve you get with drip acclimators on the outlet tube and dialed it back. Haven't had any problems since. Great product, and the sensors are far enough apart it's not constantly running, but it doesn't allow the salinity to change noticeably either.
Hydor Smart Level Controller - ATO
$106.95
Item #
HY-J03101
Manufacturer
Hydor
Shipping
Eligible for Free Shipping Program
Availability
Out Of Stock
THIS ITEM HAS BEEN DISCONTINUED
The Smart Level is the new versatile fully electronic water level controller designed by Hydor.
The Smart Level safely and easily handles the aquarium and sump water level due to evaporation or drain malfunction. It is designed to be used under the many different conditions that exist in marine and freshwater aquarium environments.
Smart Level technology reduces the problems related to lime scale deposits, bacterial film, and wave action, which ensures the continuous, safe, and regular functioning of the Smart Level control.
Fully electronic, with dual alarm providing both light and sound to alert of any malfunctioning in the water levels or the unit. Low voltage. The probe is insensitive to surface movement of the waves.
The Smart Level is ultra-compact, stops overflow flooding, works with both freshwater and saltwater, has no moving parts, is easy to install and will maintain a constant water level in the sump or aquarium. A Magnet-Suction cup support is included to allow free positioning and up to 0.4 inch aquarium glass thickness.
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Does the job with some modifications Oct 18, 2014