Cecil not sure of what you mean by sediment, but for muck, organic layers it can be reducded. When we setup the aeration system we will get things "kick started" with bacteria. I have seen in one pond where you could step and be up to your kness in nasty carp that by the following spring it was down to only angle deep. Not too scientific I know but it appears to be that if you keep the bottom of the pond in an aerobic environment then you can reduce organic layer significantly. However I also belive just putting in the bacteria products in a stratified pond is a waste of money.

Greg Grimes
www.lakework.com