Originally Posted By: overtona
You say a rotary pump....can someone recommend a few specifically for my application?
(snip)
I was also thinking about mounting the compressor up on the wall in the garage, this way there is no chance water could ever make it back to the compressor, and as long as no fitting fail my basement won't end up full of water...:-)


Rotary vane. Gast Rotary Vane Pumps Gast 1023 is commonly used. Varying hp, I think you should be fine with 1/2 hp or maybe lower. Using Vertex diffuser discs, you need a minimum of 0.5 cfm per disk. PSI needed at the disc is basically 1/2 the depth. So, if the diffuer discs are in 10 ft. of water you need a minimum of 0.5 cfm@4 psi, but that is a minimum. I'd feel a lot better if you were pushing 1 cfm to 2 dfm to every disc.

Put a foot valve in the line like they use for holding water in the line in water wells. That will stop water from coming backwards. Vertex membrane diffusers have a backflow preventer valve built into the disc design.

You will have to look at the different pressure/cfm charts for the different compressors to determine which one best suits your needs. Compressor or vacuum, each will work, just swap around the exhaust. Exhaust goes to pond.

Mounting it on the wall might cause the wall to act as a drum head and amplify the noise. Isolate the compressor by using rubber isolators to bolt it down. https://www.mcmaster.com/#rubber-standoffs/=18xtfxm

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