PuROTwist PT4000 TFC 50 GPD Four Stage RO System


The top-selling PuROTwist PT4000 RO system is a 4 stage, point-of-use Reverse Osmosis unit that treats water at 50 gallons per day. PuROTwist Reverse Osmosis Water Filter Systems offer the highest in quality and performance standards, high-capacity output, automatic shut-off and the user-friendly Twist Tap (Omnipure Q-Series) filters. To replace the filters, simply twist the used filter off and twist the new filter on. No tools, no buckets, no mess. NOTE: We now offer replacement bundles to make the annual filter change process even easier. See the replacement kits below.



  • STAGE 1 – Sediment Pre-Filter (Q5605) – Replace Every 12 Months
  • STAGE 2 – Carbon GAC Pre-Filter (Q5633) – Replace Every 12 Months
    - OR -
    STAGE 2 – Carbon Block 1 Micron with Chloramine Reduction (Q5629) – Replace Every 12 Months
  • STAGE 3 – RO Membrane TFC 50 GPD (TQ56-50FC) – Replace Every 24 Months
  • STAGE 4 – Carbon GAC Post Filter (Q5633) – Replace Every 12 Months

1 Year Replacement Filter Kits:

1-Year Filter Replacement Kit with 50 TFC GPD Membrane for PuROTwist 4000 RO (includes TQ56-50FC RO membrane to be replaced every 24 months)*

1-Year Filter Replacement Kit for PuROTwist 4000 RO System (RO Membrane Sold Separately)*

*Note: 1 Year Replacement Kits do not include the Q5629 1 Micron Carbon Block with Chloramine Reduction filters


PDF iconPT4000 Brochure

PDF iconPuROTwist PT4000 Series Manual

PDF iconPuROTwist Filter Change Instructions