Make a 4-inch hole in the center of the 5-gallon bucket lid. This is where the net pot will go when the system is in operation. Make a 1-inch hole about 3/4 of the way up the side of the bucket to allow the pump’s power cord to pass out of the bucket.
Drill 1/16-inch holes along the length of the tubing on one side. These will spray the nutrient solution onto the dill plant’s roots.
Connect one end of the tubing to the outlet on the submersible pump. Fold the other end over to seal it closed and secure it with a zip tie. The seal doesn’t need to be perfect, just enough to create pressure in the tubing so as to force solution out the small holes.
Set the submersible pump into the bottom of the bucket. Coil the tubing around the inside of the bucket, from bottom to top. Arrange it so that the holes all point toward the center of the bucket.
Pass the pump’s cord through the 1-inch hole in the side of the bucket. Seal around it with silicone. Allow the sealant to dry completely, usually about 24 hours.
Pour 1 or 2 gallons of nutrient solution into the bucket. This is available from any hydroponics supplier. The pump should be covered, but most of the tubing should be exposed.
Place the lid on the bucket. Set the net pot into the hole in the lid. It should hang down into the bucket so the roots of the dill plant are exposed to the nutrients, but it should not be in any danger of falling through into the bucket. These pots are available from many hydroponics suppliers.
Set the digital timer to turn the pump on for 15 seconds every 10 minutes. This will keep the roots hydrated.
Check the level of the nutrient solution often, to make sure the pump is never exposed. Add plain water if the level begins to drop. Replace the old nutrient solution with fresh solution every two weeks.