Aquaponics Home System – Part 11: Plant Tank Drain

To get the water out of the plant tank I’m mounting a drain in one end of the tank. Because it’s a custom sized tank I’m using pond liner inside an MDF box instead of buying a stock plastic box. It’s a bit more difficult to connect a drain pipe to pond liner than to hard plastic but this can be done by using a bulkhead fitting with a large flange:

A 40 mm (1 9/16″) pipe will fit inside this particular bulkhead, and the small rods for screws are 12 mm (1/2″). The ring to the right is fastened to the flange with screws, with the pond liner and glue in between to waterproof it.

Five holes are needed to drop the bulkhead into the bottom of the MDF box:

The largest drill I had was a 10 mm (3/8″) for the small bulkhead rods so I used my Dremel to widen the holes. For the big hole I had to go and buy a 48 mm (1 7/8″) hole saw.

Of course I drilled the holes too close to the edge so I had to cut a few millimeter off the bulkhead 😉 but it fits perfectly in the box after all:

And the drain see from below:

Nice flowers, right? 😉

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