I have a pond that was built in 1973 and received no maintenance for 30 years.I have been in the process of removing the muck from the bottom of the pond.I have been using what I am calling a hydro dozer it is an intake manifold for a trash pump.I reduced my 3" trash pump down to 2" for easier handling. I will try to load pictures of it. I pump the muck and water to another pond then let it settle and create a bloom then drain back to another pond.looks like I have to study how to load pictures.