I ended up plumbing about a third of my system with ABS with no ill affects, the only issue I had with ABS was a threaded fitting at a valve broke at the base of the threads. PVC has a thicker wall and is much dencer and therefore stronger then ABS, so I would recomend using PVC if you have to use threaded fittings. Either way you choose to go be sure to rince the pipe thoroughly before adding it to your system as both the PVC and ABS cement are toxic.
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