Surprisingly there is not much muck on the bottom as I've been testing it with a pole in the center off the pier. I can only penetrate in inch or two until I hit solid clay. I attribute this to the two membrane diffusers and rotary vane compressor I run from spring to fall. Not bad for a pond that was built in 1994.
I would've expected their to be a lot more muck on the bottom than that. At a friends pond the muck has been building up for 50 years. The pond used to be 14 feet deep but now it's only 5-6 due to the muck.
