Just after the pre filters, but I havnt used it for ages because it struggles to pump then cuts straight out.
Basically I have 30psi going into ro, then loads of pressure before membranes, then after membranes a tiny trickle of water (enough to make 150gpd in 24hours :|
I know people will think" that's your membranes need changing" but they have been changed twice in 4/5 months because I have been struggling to make water for a while and thought that was the problem. Clearly not because it doesn't improve much, and still wouldn't explain why the booster wouldn't work