Drill a hole in your grow table, and fit the washer, nut and 25mm straight
Combine this with the and you've got yourself an automatic drain to waste/recirculating system!
Note that the auto drain brain only comes with 16mm straights and no stop ends. So if you plan on using the auto drain brain, you should get yourself 1 x , 5 xs, and 2m of to drain the waste from the bucket (back to your tank or into a drain)
Kit consists of
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