Build a hydroponic grow box out of household items found at most hardware or discount stores for a low-cost method of growing vegetables year-round inside your home. Hydroponic grow boxes work well for beginning hydroponic gardeners that want to experiment with growing vegetable or herbs in a deep-water system. The grow box works in a bright indoor space or on an outdoor patio where a power outlet is available.
Remove the cover from the plastic container and lie it on a flat surface. Place three rows of netted pots on the cover with the top lip facing down. Trace around the netted pots with a marker.
Remove the netted pots and find the center of each circle with a compass. Draw a circle 1/2 inch inside the traced outline for a cutting line.
Cut out the inside line on the plastic cover with a sharp knife. Make clips from the cut edge to the traced outline marking at a distance of 1/2 inch to create flaps around the cutout to hold the netted pots.
Feed the pump tubing through the air vent holes in the container handle. Drill a hole just above the handle if air holes are not present. Attach one end of the tubing to the air pump on the outside of the container and the other end of the tubing to an aerator stone lying on the bottom of the container.
Place the container on three wood slats or large bricks to prevent moisture buildup underneath. Place a plastic covering over the air pump to keep it dry.
Fill the plastic container with water to a level where the netted pots hanging from the cover are submerged 1-inch in water. Add hydroponics nutrients according to the package instructions for the volume of water in the container.
Place the empty cover on top of the container and snap the side handles to secure. Drill a hole in each corner through the cover and container if the cover does not snap easily in place. Secure a zip tie through the holes to hold the cover in place.
Plant the seedlings into the netted pots filled with hydroponics medium. Rinse the soil from the seedling roots if they were started in soil.
Add nutrients to the container each time the water level is increased or refreshed to maintain an adequate nutrient concentration for plant growth.