NF removes most salts, pathogens and organics. Like RO the process requires pretreatment of water with chemicals or a sand-based system. NF has not been used commercially on a large scale for drinking water. Natural recharge - Natural replenishment of an aquifer generally from snowmelt and storm runoff. See also recharge, artificial recharge, incidental recharge.
Most indoor uses are largely non-consumptive.
Compare with consumptive use. A measures of the concentration of materials in a liquid, often used to describe the degree of contamination of water. One ppm indicates that for each one millions units of water there is one unit of the contaminant, One ppb indicates that for each one billion units of water there is one unit of the contaminant. Primary treatment - Initial treatment given to sewage, usually removal of solids and possibly some disinfection. Private water utility - A water provider that is owned by individuals or a corporation and sells water to customers.