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How to Grow Hydro Lettuce
Here is one easy way how to grow hydro lettuce. The hydroponic gardening system pictured here is made out of 1 inch thick blue foam, available at Home Depot. Each 2' X 8' sheet can make two hydro systems. The foam is cut using a long bladed utility knife, to make the edges square and clean. The tank is put together using a low temperature glue gun.
Each finished hydro system will be 16 inches wide, 24 inches long, and 4 inches deep. 3 inch holes for the netted pots are cut in the top, and the top simply sits on the rest of the system without being glued. As you can see from the diagram, the nutrient solution is kept at a level that keeps the bottom 1/2 inch of each pot submerged. 
An aquarium air pump is used to keep the nutrient solution aerated. If you have problems with it floating around, a stainless steel nut can be placed on the air line.
Lettuce in this system should be fed a vegetative formula at about half strength. If you are using Maxsea, that would be 2 level teaspoons per gallon. Don't forget to also add 1/2 teaspoon of Epsom salts per gallon if your fertilizer is magnesium deficient (which is the case with Maxsea).
As you can see, the lettuce above grows healthy and green, the roots below are healthy and white. This is one of the most convenient ways I have found how to grow hydro lettuce.
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