ABS or PVC Pipe - Which is Less Toxic to Use in an Earthbox?

[rnewste]

Am building out several Earthboxes now, and according to a recent edit by "josho" to his excellent instruction sheet, he is strongly urging against the use of PVC pipe as the filler tube due to toxicity issues, he claims.

Based on this advise, I am using a more expensive, black ABS pipe for the watering tube. However, I can't find a recycle number of 1, 2, 4, or 5, as josho recommends. He states to NOT use any plastic with numbers 3, 6, or 7.

Can someone tell me if ABS pipe is safer to use as compared with PVC?

thanks,

Ray