Actually, the Poseidon line operates up to 50 PSI. The PS3 max head is 26'. The Poseidon PS3 is comparable to the Iwaki 55RLT although this Iwaki is also 26' max head and 1100 gph at 0' head it is only rated up to 17 PSI. Plus the Iwaki 55RLT uses 190 watts where the Poseidon uses 140 watts.
If I don't use the eductors and the OM there is no point in reducing the return opening because it wouldn't increase the flow enough to be usable. That's what I'm worried about with the eductors...will it be enough to be noticeable? Will the eductors increase the return flow enough that the flow will hit the bottom of the tank and thus be useable to help keep detritus suspended at the rear of the tank? I don't normally look at the return as a source of usable flow, to me it's job is to operate the sump and bring flow to the skimmer. I'm simply trying to justify using the OM and the second return hole in the tank.
