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Old 01/11/2008, 11:40 PM
original kuhli original kuhli is offline
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Join Date: Jan 2007
Posts: 28
3/4 inch drain solenoids - how fast does yours drain?

I'm working on an autofill/drain system and my 3/4 drain solenoid is providing very slow drain rates, I'd estimate 50-60 gallons/hr compared to about three times that without the solenoid inline.

The drain is running to my basement from the upstairs, tank water level is 4 ft above the floor and the the drain is on the floor so I'd estimate the pressure at 15 ft * 0.433 psi/ft = 6.5 psi. The solenoid is rate to 1 psi to function so I'm gathering that its running fully open.

When complete the drain solenloid will be taking a portion of whatever the outlet pressure of a Fluval FX5 is, I'm guessing 5 to 8 psi based on things I've seen on this and other boards.

I know others have run booster pumps for such duty, I'm not pumped to do so, and my drain rate isn't absolutely unlivable but I'm trying to get a good sense of other people's experience.