This square ebb and flow tray is 4 x 110 x 100cm, moulded from UV-proof virgin plastic. The gutters feed a deeper drainage point where a lead through carries water in and out. It connects to 25mm PVC couplings sold in any hardware shop. A matching aluminium grow table holds it level.
In flood and drain use, a pump fills the tray with nutrient solution at timed intervals, then lets it drain back to the tank. The tray runs dry between floods, so roots stay oxygenated. The square shape suits blocks of leafy greens, herbs or propagation trays. Lead throughs not included.