Devil makes work for idle hands. So going to try this out instead of an outboard canister this year. These saddle over a cedar 4x4 that will now bridge the back of the pond. Going to plant them with local rushes, some smaller cat tails, Creepy Jenny and whatever else I find in the local swamps. 2” of lava at the bottom and pea gravel the rest. Just need to finish the over flow spouts.