Filtered and unfiltered water ducting in sink fitting

A method which includes the steps of:

• a) providing a multi-ducted fitting, attached to a sink panel,
• b) providing a waste water upright duct associated with said fitting, and providing and operating reverse osmosis apparatus from which waste water flows to said duct,
• c) providing and operating a dish water upright duct associated with the fitting to flow unclean dish water upwardly,
• d) and providing and operating a discharge duct associated with the fitting to receive flows from both the reverse osmosis waste water duct, and the said dish water flow duct, for downward flow relative to the sink,
• e) there being a housing surrounding said ducts, to be received in a kitchen sink associated panel,
• f) said housing having a wall portion forming a portion of said discharge duct sideward of both said waste water duct and said dish water duct, and
• g) providing a clean water duct in the housing connected for discharging clean water to the faucet.

In a system for handling closely proximate flows of relatively clean and unclean water, the combination comprising

• a) a first conduit for passing relatively clean water to a first discharge,
• b) a second conduit extending protectively about the first conduit,
• c) a third conduit extending proximate and lengthwise of the second conduit for receiving said relatively unclean water, outside the second conduit,
• d) and an outer housing extending about said first, second and third conduits,
• e) said third conduit having a free discharge proximate to, but isolated from the interior of said second conduit,
• f) there being a fourth conduit, proximate to said second and third conduits, and having an entrance to receive contaminated water discharge from a reverse osmosis filter means, and flowing from said second conduit,
• g) said second, third and fourth conduits configured such that
• i) said second and said third conduits have a primary common wall
• ii) said second and fourth conduits have a secondary common wall
• iii) said third and fourth conduits have a tertiary common wall,
• h) said primary, secondary and tertiary common walls having a common junction,
• i) and wherein said common walls extend arcuately away from said common junction, such that both said secondary common wall and said tertiary common wall bulge toward and into said fourth conduit,
• j) said fourth conduit having a flow cross section in a plane normal to lengthwise extent of the four conduits, that flow cross section characterized as located sidewardly of and having area substantially in excess of the total cross section areas of the first, second and third conduits.