I am looking for something to run hydro drain to waste
You might like rockwool cubes. Sounds off topic but a big cube or a 4" cube on top of a 6" cube is really just a hempy bucket without the bucket.
I did perlite "hempy buckets" before it was so named (1986), perlite/vermiculite, promix, soil - and will never do those again because rockwool cubes define no muss no fuss.