Just built two 3'x3' flood tables so thought I'd take some pics along the way
Botanicare flood trays are 120$ or more, so if there's no leaks this could save you guys some cash. Total cost was about 80$ to make both
Cut 2x4's to length and screwed them together. Then I screwed my 3x3 piece of plywood to the bottom
The waterproof material is called pond liner. This was the most expensive piece, coming in at 50$
I used an all purpose glue to stick it to the wood, then screwed the excess to the sides. Not pretty but it works
Cut a 1 1/4" hole for a pvc coupling to attach
Used caulking around both sides of pipe to keep water away from the plywood
Used polymer for outdoor decks to help waterproof everything some more.
I'm gonna wait to install the legs
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I love it but the results I'm getting from coco are blowing soil out of the water, clones are literally triple the size 
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