The bottom of my 30,000 gallon fish pond is full of sludge and fish s^&t. I want to try to make a venturi style sump pump. These pumps are extremely simple. They work by using a high pressure water jet to move a large volume of water at low pressure.
Here's a little bitty one:Here's one for a basement sump application: Here's one moving tens of thousands gpm: For my job, I have a 10 gpm 400 psi piston pump (tractor PTO driven hypro model 5200). I have a 2" suction hose fifty feet long. I'm thinking of building the pump into a 4" plastic sewer pipe Tee. The bottom of the Tee would be the suction inlet. The right of the Tee would have the high pressure water nozzle. The left of the Tee would be the outlet. It would look just like the unit in the first link only a bit bigger.
I need design help. Specifically what size orifice should I try for the high pressure outlet. And where should the orifice be located. Also 4" ID of the tee is probably too large, what would be the best ID to use? Any other suggestions?