for anyone who really knows about the this sort of thing how does this sound 
its a 300 gpd ro-man
tds in 420 
tds out 017 (before di)
production rate 25 ltrs per hour
pure to waste ratio 2.25 to 1
no booster pump mains pressure only
system running at 50 psi
is that ok i 

i am fairly happy but is a booster pump worth bothering with and what sort of difference should i see ...discuss
cheers