The OROS-80-ALK is designed to purify tap water and well water to provide clean， high-quality alkaline drinking water. The OROS-80-ALK features 6-stages of filtration; a 5 micron sediment filter (stage 1)， 5 micron carbon block filters (stages 2 and 3)， 0.0001 micron 50 GPD RO membrane (stage 4)， a post-carbon filter (stage 5) and a US-made calcite alkaline filter (stage 6). The alkaline filter re-mineralizes the purified water with calcium carbonate to increase the pH/alkalinity of the purified water. The system uses 10 in. industry standard sized pre-filters (stages 1-3). OROS-80-ALK has not been evaluated to NSF/ANSI standards 42 and 58. The OROS-80-ALK is the combination of OROS-80， which is a NSF certified system (NSF/ANSI 42 for CTO and 58 for TDS)， with OROS-ALK， an alkaline filter that has not been evaluated to NSF/ANSI standards 42 and 58.

Filtration portion of the system measures 16 in. W x 7 in. D x 23 in. H and the tank measures 12 in. W x 12 in. D x 18 in. H， fitting most under-sink cabinets

100% Calcium Carbonate remineralization filter to increase water alkalinity/pH (6th stage)

Calcite filter neutralizes purified water acidity to enhance taste and provide purified alkaline water

Non-air gap， chrome-finish， lead-free swivel spout faucet with ceramic disc valve

Includes system head， filter housings， 3.2 Gal. storage tank， complete filter set， color-coordinated tubing， premium quality chrome-finish faucet， installation kit and detailed owners manual with full-color photos

Simple installation with color-coordinated quick-connect fittings， pre-installed flow restrictor and automatic shut-off valve

USA based customer support from Olympia Water Systems