[untamed]

Originally Posted by kaboom

I'd really like to see your close loop design, anyway you can post some diagrams/photos? Or perhaps describe the layout, # of intake/outlet, position and gph per outlet. Really admire your setup!

As the Dart is rated at 3600gph with 0 head, I expect I'm pretty close to 3000gph through each CL depending on friction loss. 2" pipe to the pump, 1.5" output from the pump, 4x1" outlets from the 4-way.

You might refer to page 2 of this thread for more detail, including pictures of the pumps, 4-ways and back intakes/outlets.

Here's a flow diagram of the 2 closed loops. This is a top view, so you can see the position of the tank bottom outlets. Red/Green fire together, then purple/brown. The one grey line coming straight down from the right loop is actually at tank drain. Arrows show direction of flow through the loop..NOT the direction of water in the tank or the direction that the outlets point. Little triangles are union ball valves.



As the 4-ways rotate, the 2 back wall outlets all fire at the same time, then the tank bottom outlets fire. This pushes water forward and generally downward, then upward and back toward the overflows. The idea is to create a "rolling effect". It would have worked even better if I had placed the "red" outlets closer to the front of the tank, but I couldn't stand to look at them there.

This also has the effect of blowing the sand/detritus toward the front of the tank...which will keep stuff out from under the rockwork and up front where I can see it and clean it out.