I stuck to the 2:1 ratio for my siphon. My bell is 3" and the standpipe is 1 1/2. My drain pipe is also 1 1/2. The drain goes down, makes a 90 and then goes through a 15" spray bar, makes another 90 and then another 90. In the second 90 I angled it up slightly to help the siphon start. It took some playing around with the angle on that second 90 and the amount of water going into the grow bed to get it to start properly and to end properly.



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