Thanks Spruce, as always you are a star!
Now I'd better just check!!
After the booster pump fit a jg tee and split the water to each of the two membranes.
Other end connect waste from the two membranes into another jg tee and into main waste pipe?
Does splitting the input to the membranes alter the pressure?
Thanks very much.
I am ugrading my system at the moment, found out my booster pump was not powerful enough for a 300gpd unit, also fitting softening resin chamber, carbon block filter and larger resin vessel.
Should be a lot more effective.