[jjames]

I have recently bought a system which came with an almost unused merlin ro. The pressure going in is 30 psi, I take it this is not enough pressure. It is getting the tds down to 80 from 270 ppm. Any help appreciated

[EandM]

You need a booster pump - the Merlin works best around 60 psi and I think the maximum is 80 psi.

[jjames]

Thank you that is what I was thinking, I may sell it on as I was thinking of rainwater harvesting anyway.