personally steve i would say NO
if your going to spend 85 quid on the pump, you might aswell spend 65 quid and get the 100Gpd Membrane Upgrade Kit from RO man, this will increase your production
but as i said, mine is very slow, i leave it on for 48 hours and its job done my water butt is full
why not leave your exisiting running for 48 hours and see what you get, you will be s.prised