Originally Posted by fishfrank
Actually my plan was to have the three diffusers ganged together off one single weighted line.


Then you can ditch the manifold valves, but I'd still recommend the other items. I am assuming when you say ganged together you mean all at the same place in the pond.

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).