This is a floating up weller built by John that we based ours on. The left side attaches to an anchor and as the water flows by a venturie effect is created drawing the water up thru the screen.
The buckets turned udside down.
Screen to hold the clams in and keep the critters out.
The float uses a pine board on top, a 1" piece of foam and a piece of plywood to hold the buckets. This photo shows the arrangement upside down.