fivebucks:
We have been using the ChemFlex Kynar plastic injectors for about 2 years now on our
Washworld equipment - They are definitely better than the original SS injectors. My low PH presoak was killing SS injectors in 3-4 months, Now I can get a year out of a set of plastic injectors. The SS portion of the ChemFlex injector still corrodes with time, and a year is pretty well the max expected life with low PH. They seem to last much longer with high PH chemical
One note - Make sure you test draw rates and titrate after changing to them - They seem to require one larger orifice size to draw the same amount of chemical as the SS injectors.