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This the conceptual design of home made autopot equivalent hydroponics water level controller unit (aka the unit) . Here is how it works: 1. Nutrient solution is supplied by a big tank to the unit through the inlet nozzle (yellow) . 2. When the solution level rises up to a high level mark , the float valve (made from a pill box) is lifted to a position that blocks the nozzle (yellow) stopping further in flow. To compensate for imperfection of the contact surfaces and ensure a tight seal, a silicon tape(green) is attached to the top of the float valve. 3. At the same time the peg (orange) is lifted to plug the air hole of the unit loosely. The rest of the gap is closed with the help of the surface tension of the nutrient solutions around the peg. This blocks the air hole completely creating a vacuum inside the unit. 4. Plants will consume the nutrient solution causing the level to drop. However the vacuum condition inside the unit keeps the solution inside supporting the float valve that continues to block the nozzle (yellow ) and stop the inflow. 5. When the level drops below the low level mark which is set by the notches at the base of the Unit, the vacuum condition will be broken and the solution inside the unit will be released lowering the float valve. The water inlet will be unblocked allowing the growth bed to be filled with the nutrient solution again. 6. The cycle repeats until all nutrient solution in the bigger nutrient tank runs out.