I have finally finished the new pipe work necessary to install a new filter pump (it only took me 3 months!) The inlet to the filter uses a threaded fitting though, so I'll need to use either teflon tape or a thread compound to seal the joint before I can try it out.
PTFE tape seems to be a popular choice, however I've read warnings that the tape lubricates so well that it can lead to over-tightening of the threads, resulting in excessive stress (and possibly failure) of the fittings. Apparently the best choice would be a non-lubricating, non-hardening, PVC safe thread sealant.
But Teflon tape is available everywhere, while thread compound with the above properties doesn't seem to be available locally.
Am I worrying too much about this? Should I just go ahead and use tape? The threaded fitting on the filter valve seems to be glued in - if it did fail it would not be an easy fix!
I'd appreciate any thoughts or advice anyone cares to share on the subject.
Oh, a bonus question: I plan to use silicon grease on all of the union o-rings. Any reason not to?