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Sub-Zero with Reverse Osmosis Water System


  • Can the water supply for a Sub-Zero come from a Reverse Osmosis (RO) system?
  • Can Sub-Zero with an internal water filter be connected to an RO system?
  • Are there any concerns when using a Reverse Osmosis system?


A reverse osmosis (RO) system may be used with Sub-Zero products.

  • It is acceptable to connect a non-water filter model to an RO system as long as the water pressure remains steady and is adequate between 35 - 120 psi.
  • This ensures the icemaker will operate properly.
  • Consider adding a pressure booster or regulator if water pressure is inconsistent or too low.
  • Contact the reverse osmosis provider or speak with a plumber for suggestions on boosters.
  • Copper should not be used after the RO system, as this can cause leaching. Check with your RO provider.
  • For models with an internal water filter already installed, it is advised to bypass the Sub-Zero water filtration system when connecting the product to an RO system.
  • See also, Bypassing Water Filter on a Built In Model.

Refer to the product use and care guide for further information. Refer to the product installation guide for further installation information.

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