Ted,
That's correct, the pipe is for the water supply in the Earthbox, and Josho was concerned that some of the chemicals in PVC could cause "endocrine damage" as the water is ingested by the tomato plants (and then we eat the tomatoes). Not sure his source of scientific data - - but since I am building 12 of these Earthboxes, I want to select the safest components to use.
Ray
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