A cornerstone of Hydroponics on the cheap.
4 x Water Bottles
1 x drill or knife
1 x Aquarium Air Pump
1 x AirStone
3 ft Acrylic/Silicone Tubing
Step 1: Make Holes!
This hole saw is the perfect size for a water bottle. (3/4"?)
This is great for plants you don't intend to move. But I hadn't planned on transplanting from an AeroGarden. So the roots were a little tough to squeeze into the tiny holes. I ended up just making another lid the exact same way with bigger holes.
**Don't forget a small hole for an Airstone! An extra hole to use to for water refilling is a good idea too!
PRO TIP: Run the hole saw in reverse to get a smoother hole. (See pics for difference)
Step 2: Make Planters!
I used the hole saw to modify the water bottle lid to make a retainer for the planter.
Then cut the bottom of the water bottle off. I left the bottle as tall as possible. This works well for using the old bottom as a lid to keep humidity up for cuttings or seeds. Some people paint the water bottles to make them opaque. I don't bother.
Step 3: Put It All Together and Plug It In
I noticed new and vigorous root growth after about a week on the root bound ones. Vigorous vegetative growth on those that already had decent roots. A lot of dead roots were cast off into the water. So keep it clean and grow monsters!