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The number of trays you would like to use is totally up to you..we just went for 3 to allow more room for our bottom/bigger plant species, and to keep the exposure of sunlight and water temps down for the reservoir.
We used PVC rain gutters...they are made to withstand a constant bashing from the sun, or else no one would buy them for their houses :)
Hi, we've uploaded a pic of the system in full flight at the early stages of the grow season. You can view the pic at the final step of the instructable. Good idea for the room divider, you would just need a lot of sunlight or artificial lightning for the plants.
Thanks, some extra grow space can only be good:)
Clip-on Hydroponic Wall Garden