Well I have seen all kinds of things for covers!!
But I took a 1/2" piece of ply and cut it the same as the inside size of the cut barrel.
Then I cut a square hole in the cover and added a couple of hinges and a handle.
I gave it about 10 coats of poloyurathane to keep it from rotting.
Then set it into the barrel and used stainless screws all the way around the out side screwing into the ply. Cover is done!
Then I took and put a 1000 gph pump inside the tank with a strainer on the pump to keep the scales and stuff out of the pump. I have a friend that has a 500 gph and it also works good.
I drill a hole thur the side and put a 3/4 fitting on the tank. On the inside I took a piece of pcv and heated it and flattened it out so it pushes a fan spray .
I run the hose from the pump up thru the cover (need to drill hole just big anough for the hose to come thur. and put hose on out side of tank on to fitting. This will recirlate the water.
When you want to empty just pull hose off fitting and hang over board and let it pump till empty.
I drew a couple pic to show you. I am not the best at this. But if you need me to I could go and dig it out and take a pic.
Good luck
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