Steve M.

1.) What type of compressor, hp, piston, rotary vane?

2.) How deep is the diffuser?

3.) What type of diffuser?

4.) Does the 200' include the tubing in the water? If not, what type of tubing and what is its diameter?

200' of 1/2" tubing only has a friction loss of 0.24 psi. The depth and type of compressor will be the only limiting factors.

Medowlark is right about the heavier walled pipe if you have equipment or vehicles traveling over it.