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This is a gravity water feed I made for my sulphur denitrator. I believe the water flow it will provide will be very consistent (a lot more consistent than coming directly from a centrifugal pump). The gravity water feed is made using a DI filter housing. The water comes from a water pump in the sump, goes through a gate valve that I have all the way open, goes through a filter that came with the sulphur denitrator, then the water goes up to the gravity water feed siting on the aquarium overflow.
The water enters the gravity water feed through the tubing on the right. The tubing that comes out of the top left is for excess water( you always want a least some water coming out of it). The tubing that comes out of bottom left goes to the control valve that came with the sulphur denitrator under the aquarium. And then the water goes into the sulphur denitrator.
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