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I use 1/2" Hydrofarm for the feed and
3/4" Hydrofarm for the return.
When I used the 1/2" for the return line, my 33GPH pump
was pumping most the nutes out of the control rez on low.
With the 3/4" return line, the pump is on
high and the level drops maybe 1/2" @ most.
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