Step 13Enjoy!
Top of your nutrient reservoir with a normal mix of nutrient.
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As a matter of fact the design was changed this year! I'm using styrofoam bins as reservoirs instead of buckets, as each holds about 2.5 buckets of nutrient. The reservoirs were placed as close as possible to the edge of the roof (they are reversed in contrast to the current pictures) to reduce weight on unsupported portions of the roof.
I'm concerned about using the support stand boxes for holding nutrient solution, too, because of the weight. My landlord has been very kind to allow me to use the roof for this project, and I'd hate to jeopardize that good will.
As you also suggested, I'll be daisy chaining the styrofoam reservoirs so that they self equalize.
Updated pictures to come!