Koenders doesn't put out enough air to have any wave action. The Koenders that I am familiar with (both electric and windmill) only put out less than 2 cfm, and they are closer to 1 cfm. It doesn't help that they furnish 3/8" tubing for the system.

Had problems with the 3/8" tubing freezing up under ground too, so the alcohol anti-freeze tanks are mandatory. Never had a problem freezing with buried 1" Poly pipe.

One customer had us trench in replacement 1" poly. Then this year we switched to a Gast 0523 rotary vane to replace 2 of the Koenders electric compressors. Half the electric cost, roughly 3x the air output and it really shows at the diffusers.


3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).