???

I'm not sure what that has to do with my question. I'm not even sure
what you mean by "pressuring up the system". Are you, perhaps,
responding to someone else's question? If so, please excuse my
intrusion.

But thanks, anyway.

In article . com,
says...
Meaning: The RO filter (and it's attendant pre-filters) don't benefit
from pressuring up the system. Tom