There is a length of aquarium airline running into a piece of sponge inside the drainage layer. I have a valve on the end outside of the tank so I only had to siphon once. When I need to drain water, I open the valve. When I drained off enough, I close it and the siphon is ready for the next draining.

I would have preferred to drill the tank for automatic drainage, but I did not want to ruin the tank in case I ever want it to be an aquarium again.


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