So glad I got this pump , just fitted it to replace my Clarke style booster pump .
I was getting 60 psi from my centrifugal pump but loads of flow .
This pump is giving me about 130 psi .
My tds has been climbing steadily from 8 ppm , was at 35 ppm before fitting this pump .
The membrane was a bit slimy as was my holding tank so I bleached everything including the membrane .
I assumed it would be knackered so ordered a new one .......the old one is now getting 6 ppm after I soaked it in bleach toilet cleaner and fitted new pump !