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post #4 of (permalink) Old 02-21-2013, 05:06 AM
Planted Member
Join Date: Nov 2012
Location: El Cajon
Posts: 220
To answer this question is a little tough. Are you going to have a chamber designated for the overflow? If so, you want it set up so the openings of the 2 downturned 90 degree elbows are just below the desired surface level of the water, and then for the third pipe with the upturned 90... you want that a little ways below the top of the tank but above the desired water level, that way it only gets used if the water raises above normal operating depth due the a clog or something. Be ware that this system allows you to control your water level to a degree in the chamber its in, by slowing the siphon you can raise the water, and by opening the siphon it will lower the level... its a fine balance but very effective.
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