Everywhere in your pond that is below the thermocline muck is building up MUCH quicker than above the thermocline. That is due to the absence of O2. Without O2, the muck eating bacteria won't work near as well. If it was my pond, I would focus my energy on getting an aeration system in before focusing on bacteria, no matter how cheap it was.....

The aeration system has many other benefits besides reducing muck.......

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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).