I am using both the mechanical and bacteria method. I have been using a trash pump to suck the muck up and pump it to a pond above the one I am working in then let the muck settle and drain water back to the pond. Then after I have enough in the upper pond I let it dry and remove it with my excavator and dump truck. It is not a fast process but there's forty five years of build-up that I have to remove.I also have been using an enzyme and bacteria product.
