If u have to boost the 300GPD u will have to do the same with a 40 inch set up and BOY do the pumps needed for a 40 incher make a noise. A whole lot more than a small system booster pump
how much noise ? I am thinking of getting one
I don't use a booster pump and it works spot on.
Then ur water pressure must be decent.
ALL Ros are dependent on water pressuref or output and TDS reduction. Basically the better the pressure the better the output/TDS reduction.
A 40 inch WILL work @ 40 PSI but not very well at all. The same does for the smaller systems.
Ian.. it's a LOT of noise mate. It needs to be mains powered to do the job properly. 1 to 2 Horse power ones are pretty normal for boosting 40 inch systems.