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Reverse Osmosis (RO) – PERM Filter Change Schedule

Stages 1, 2, 3 Pre-Filters: Replace every 12 months

  • Private well water source: may need to replace pre-filters sooner than 12 months due to heavy sediments and other particles.

Stage-4 Membrane:

  • City Water: Replace every 3-5 years depending on input water quality, water usage, and pre-filter change maintenance.
  • Private Well Water: Replace every 2-3 years depending on well water quality, and pre-filter change maintenance. 

Stage-5 Carbon Filter: Replace every 3-5 years

  • It’s best to replace this filter when replacing the stage-4 membrane.
RO-PERM Filter Replacement Cost:
Stages-1, 2, & 3 Pre-Filters: Stage-4 RO Membrane: Stage-5 Carbon Polishing Filter:
Cost:  $39 Cost:   $85  Cost:  $15
Item#: FILTER-SET Item#: MEM-90 Item#: 5-TCR
Note: per set (1 sediment & 2 carbon block filters) http://www.freedrinkingwater.com/parts.htm

Question:  How do I know when to change the membrane?

Answer:  When the Pure Water TDS reading starts to increase (easily detected by a hand-held TDS water meter from APEC), it’s time to replace the membrane and the Stage-5 carbon filter. Please see “Owner’s Manual” Part II for details on how to test your water’s quality and membrane using a TDS meter. 

TDS-METER http://www.freedrinkingwater.com/parts-miscellaneous.htm


If the issue was not addressed, please contact us at:
800-880-4808, or

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