This is a cheap and great way to grow a bunch of seedling in a small space.
I use a "windowed in" porch.
You will need
Sub-Pump (i used a 500 watt made for dirty water)
Plastic Bottle Caps
Hot Glue Gun lost of glue sticks
A awe on any sharp pointed thing you can use to poke holes in.
Scissors Sharp enough to cut garden hose.
A plastic barrel the size depending on how much tubing your going to need
trays as big as the shelves if they are not solid to catch water
Seed starting containers
Step 1: Step One: Arrange Your Shelving
I used a couple of different kinds of shelving there was 2 cheap plastic ones that came apart, and put them out in front of the window, Then took a metal 3 tiered shelf and put it in the adjacent window.
The plastic shelves i drilled a hole into, and at the bottom they are linked with a drainage tube, into a smaller bucket.
Under the metals shelving i put a big plastic tray, i got these from a pizza shop that was going to throw them away.
MAKE SURE THE SHELFS HAVE ENOUGH SUNLIGHT, the place i set this up at has a lot of sun, So i did not set up any addition lighting here.