I keep my rockwool cubes in the water only about 1/4 - 1/2 inch when the water pump is on. The cubes will suck water up through them. The key is in the timing: how long do the cubes take to absorb all the water and how long do the cubes take to dry out. Some testing should let you know and then you should be set.

The actual instructions that came with my cubes said to have the cube 1/2 inch above the water line but since I, like you, used clay pebbles and an ebb-n-flow system I don't think that would work.

Other than that great plan and nice build, hope all works outs.

another thing I have found is covering the clear plastic try with something that impedes light is beneficial. Roots don't like light. The roots will eventually find there way to the side of the tray and when they encounter light is will slow root production.

Great input, thanks!

I was actually concerned about this myself. I have some black duct tape that i will wrap around the trays (would have painted it but too late now). That should keep it darker.

if you still have the lids to the tray you can use your whole saw to make holes in it and place it over the tray, that's what I did.

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My trays are not deep enough. Good idea tho

Be careful with duct tape, I have heard of it molding. Never happened to me but has happened to friends, just saying be careful with whatever tape you use. Something about the actual adhesive used that causes mold to be able to grow not so much the actual tape.

Very cool setup.


Steadily taking notes... look forward to your progress.

NP, this was gen 1 and im on gen 3 already. Let me know if you have any questions the basic idea is the same, im just using larger tables. My latest one is a 15 plant setup in one large serilite under bed container. I also went to painting them black on the outside.. The 15 plant table took about 55 lbs of hydroton, lol

Oh and the last flood table with hydroton was just over 75 dollars for a 15 (6x6 rockwool cubes) plant setup, Thats pump, hydroton(40.00), containers, flood and drain pieces (6.95 hydro store ones), res.. Not bad!

I tried fooling around with those same sterilite containers before because I liked the dimensions but I eventually found the material they're made of too brittle and prone to cracking, breaking, leaking especially after being drilled through or otherwise modified. I'd keep an eye on that shit.