I have a 1/4 acre pond that was completely covered in a thick layer of duckweed and mosquito fern. There are lots of posts on the internet reporting speculation that trash pump removal might work but not to many direct reports. Recently I was able to essentially clear my pond of duckweed with a very cheap (cheapest amazon.com sells) 2 inch semi-trash pump. Just wanted people to know that this is an option for duckweed choked small ponds. Before and after pictures attached.