Solo visual hydroponics

After my first entry into the solo cup challenge with a container full of rock wool, it became clear that the small 473 ml (16 oz) root zone needed to be 100% available for the roots alone. Otherwise, the plant will become stunted and stressed which causes early onset of the flowering response. The rock wool solo was 20% the size of the same seed batch with the same nutrients with an ample container size for the root zone. This mini hydroponic set up was made with transparent containers for visual observation of the root zone and nutrient reservoir with pump and air supply to the root zone... just for the added element of fun. The root zone container was double walled so before using the Dremel tool to route the hole for the bulk head attachment for drainage, I drilled a small hole for injection of two-part epoxy into the space between the walls to avoid any potential cracks when screwing the bulkhead tight. In hindsight this was not required as the walls were relatively thick and strong. Once the epoxy set up I used the Dremel tool to route out a 32mm hole for the external threads of the bulkhead to slide thru and secure on to the lid with the nut tightened up underneath. The 10mm straight male barbed pipe attachment was then screwed into the internal threads of the bulk head to attach the nutrient pump supply tube. The nutrient solution supply pipe includes a "tee" between the pump with a reducer to accept the 6mm air supply tube which is directed up into the bottom of the root zone with a small round 20mm air stone which also serves to prevent the roots from entering into the pipe and escape the confines of the root zone container. A small pump with flow control dial is attached to the pipe for supplying the nutrient solution with a continuous interval on/off timer with cycles capable of 1 second. The screw on lid was routed to accept a small rock wool cube on top.