Watts 4 Stage Manifold Reverse Osmosis Filter Pack

Regular Price $66.58 On Sale $39.95
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Made in USA Watts 4 Stage Manifold 4-Stage Reverse Osmosis PWRO4 Filter Pack

There are lots of filter companies selling Reverse Osmosis filters, but if you look closely, you'll find that nearly all of them are made in Taiwan or China. While it is not always possible to sell everything that is American-Made, this 4-Stage Reverse Osmosis Filter Pack is entirely made in the USA using NSF Certified Filters. Not only are they made in the USA, they're the best in the industry, Hands Down! You can trust your water to US Water.

4-Stage Filter Pack for RO Systems that do not have a final in-line filter includes silicone to lubricate the O-Rings and RO Sanitizing Solution, so that you can trust you water to be as clean as it can be.

Fits Most Sump-Type Filters Using Three 2-1/2" x 9.75" (10") Housings and with no in-line filter on the top.

All Filters are NSF Certified for High Purity Reverse Osmosis Systems and are Made in the U.S.A.


  • (1) 5 Micron Pre-Filter (7100331 Compatible)
  • (2) Carbon Block Pre-Filters (710046 Compatible)
  • (1) Silicone Packet
  • (1) RO Sanitizing Packet
  • (1) Syringe
  • Detailed Instructions
  • On-Line Video

It is recommended that filters be changed at 6 or 12 month intervals, depending upon water quality.

Membranes are listed seperately, below.

additional information

American MadeYes
Filter Size2.5 x 10
Filter TypeReverse Osmosis Filter Packs
Micron Rating5 Micron
ManufacturerUS Water Systems