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where should the PSI be at?
Sorry, wanted to be a bit more detailed but I've been really under the weather the past few days. There are different kinds of booster pumps and some are made for slower GPD membranes and may only boost up to 50psi. Do you know what kind of booster pump you have?
If trying to get the rated output from a membrane they have multiple factors in place which includes pressure and temperature. Being in the winter the lower temp water really hurts the production of a membrane and combine that with low pressure and you have a double wammy.
Like a 75GPD Dow filmtec membrane which is pretty common is rated to get 75gpd with 250 ppm softened tap water, 77°F (25°C), 50 psi (3.4 bar), and 15% recovery.
But a 150GPD Dow filmtec membrane is rated to get 150gpd with 550ppm soften water, 65 PSI, 77 degree F water, 15% Permeate Recovery, Data taken after 30 minutes of operation