What metal OK for RO water?

[banditpowdercoat]

I wasn't thinking for storage, but for the control valves. I am building a automatic RO/DI Storage FILL, as well as a AUto Purge and Membrane flush setup.

DI will mess with the metal though?? Bummer. Was hoping to get away with it....


Heres some gogle info I'm finding.

DI water penetrates (316L & 304) SS with a rate of up to 20 mil/yr. For best results use 316L that is electropolished and passivated. However, this would not prevent ions leaching from S.S. Heat makes things worse.

There are DI water heaters made of Stainless steel from Cole-Palmer and others. Also Watlow has DI water heater made of S.S. & made of Quartz.
However, I would like to know or obtain a references about the rate and type of ions leaching from 316L S.S. specially at elevated temperature.