Hydroponic stackable tray planter system

This is a work in progress that I am making for personal use. I will be adding more features as they progress. The idea is to have a fully automated watering system. 

Currently water from the top tray runs down to the bottom tray and drains out everything ovem 5mm depth. 

Hydroponic planter tray 200 x 280 x 40 mm

5 x 7 40mm units