Plumbing, not potable water certified. ?

[Delphinus]

Originally Posted by hillegom

Do you just go to the hardware store and buy parts and not even ask?

Pretty much.

ABS seems to be commonly used for drainage applications, but people seem to use it in tanks just fine.

PVC seems to be more for irrigation, again, seems to be used just fine. I tend to use PVC myself, no real reason that I choose it over ABS other than "it's what I've always done."