Important information about CPVC

[broadbill]

downpantera: Is there a certain point at which cpvc will stop leaching organotins?

The EPA report has an experiement where extractant water at approx 160F is run through CPVC pipe for 22 days. They show that organotin leaching is highest in the first 24 hours the water is running through the pipe then decreases to undetectable levels after day 2.

I know downpantera has issues with the experimental analysis, but I would think that the percent/fold drop should be consistent, regardless of extraction method (i.e you would still observe a 100-fold reduction in leaching, regardless of a crappy vs. good extraction method).

Long story short: yes, CPVC appears to stop leaching organotins very quickly. A good thing to do would be to run hot water through your setup before using.

 

[downpantera]

Well something to think about is that if the cure layer has been breached (by drilling holes and/or not using cement to seal the joints) the extraction coefficient is much larger and the decay is much less steep. That being said, I would guess that after maybe 15 - 20 brew sessions you might see the levels of organotin quite low (that is, if you don't scratch the cure layer).