Reverse osmosis filtering apparatus with concentrate dilution

Liquid filtering apparatus comprising, in combination:

• a plurality of reverse osmosis filters, each of said reverse osmosis filters having an inlet, a permeate exit outlet and a concentrate exit outlet;
• a liquid pump;
• liquid flow path defining means connected to said liquid pump for delivering feed liquid under pressure to said plurality of reverse osmosis filters, said liquid flow path defining means providing concentrate flow communication between the concentrate exit outlet of each reverse osmosis filter to the inlet of another one of said plurality of reverse osmosis filters, said liquid flow path defining means including branch liquid flow paths adapted to deliver said feed liquid separately to each said reverse osmosis filter to separately dilute each concentrate stream flowing therefrom;
• and
• liquid recirculation means operatively associated with said plurality of reverse osmosis filters and with said liquid flow path defining means for recirculating under pressure liquid including concentrate produced by said reverse osmosis filters through said reverse osmosis filters seriatim.