US Water AR-4 RO Replacement Filter Pack

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Replacement Filter Pack for US Water AR-4 Commercial Reverse Osmosis Systems

Replacement Filter Pack for US Water AR-4 Reverse Osmosis Systems

It is recommended that filters be replaced at least every 90 to 180 days. Some applications my need more frequent intervals.


  • (1) 5 Micron Spun Poly Sediment Pre-filter
  • (1) 10 Micron Carbon Block Filter

This is a Standard Factory Replacement Package

Also replaces USCRO-1000, Flexeon AT-500, and Flexeon AT-1000 systems

additional information

American MadeNo
Filter Size4.5 x 10
Filter TypeReverse Osmosis Filter Packs
Micron Rating5 Micron
ManufacturerUS Water Systems