ph testing

[sapman]

Haven't seen discussion about this in awhile. I'm about out of test strips, which I've been pleased with. I just noticed litmus strips on Amazon for real cheap. Is anyone using them, and liking them? Pretty reliable?

Thanks

[doocat]

Can someone explain to me the reason for testing pH for RO cleaning?
We have been running and cleaning our RO for years and have never tested ph. Should we?

[brookledge]

Depending on the type of membrane you have, depends on the ph that you meed to clean it at. I have a ph meter that I just dip into my wash tank. I check it a couple of times during the wash cycle.
Keith

[WESTVIRGINIAMAPLER]

You can get digital PH meters on eBay for $10. You can calibrate them with milk which has PH of 6.5.

[tuckermtn]

we use the test strips. got them from McMaster Carr. only complaint is the shade of purple is hard to tell if its 11 or 12ph.

[sapman]

I bought a meter a few years ago. Don't think I made it through the season and something screwed up on it so I couldn't calibrate it. So I just figure the strips are more foolproof for me.