Tubing: PVC 80 / stainless steel 304 et 316 / Polypropylene
Pumps: stainless steel 304 et 306 /Noryl /Brass
Manual valves: stainless steel 304 et 316 / PVC 80 / Epoxy
PID valves: stainless steel 304
Selenoïdes valves: stainless steel 304 et 316 / Brass / PVC
Pressure sensors: stainless steel 304 / 306
Flowmeters sensors : Polyfluoroethylene (PTFE) / Acrylique
O-rings EPDM / Viton
Membrane material membranaire (for RO) Polyamide / Polypiperazine/Cellulose acetate
Spiral wound Membrane glue: Époxy
Permeate colection tube (inside membrane) PVC 80
Cleaning tank: Polyéthylène
Membrane housing (pressure vessel) : Stainless steel 304 et 306 / Fiberglass / PVC
Stainless steel 304 is not really worth to be used in RO. If you really want to use Stainless steel, use stainless steel 316.