Questions that hasn't been asked:

How are the diffusers placed on the pond bottom? Are they up off the bottom a ways? Is there something under the diffuser to keep it from stirring up the bottom sediment directly adjacent to the diffuser?

I've seen diffusers built in such a way that they are up off the bottom by a foot or so, and others that have a 3' square sheet of plastic under them.

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