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PuROTwist reverse osmosis system with four slim cartridges, storage tank and faucet

Reverse osmosis system

PuROTwist PT4000 TFC 50 GPD 4-Stage RO Replacement Filters

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 schedule

Compatible parts

Everything that fits the PuROTwist PT4000 TFC 50 GPD

Omnipure Q5605 Q-Series 5-micron sediment filter, 2.5 x 12 inch
Omnipure
Omnipure Q5605 Sediment Filter 5 Micron 2.5" x 12"
(36)
$23.99
NSF 42 Certified
Omnipure Q5621 Q-Series 10-micron carbon block filter, 2.5 x 12 inch
Omnipure
Omnipure Q5621 Carbon Block Filter 10 Micron 2.5 " x 12"
(18)
$24.99
Reduces chlorine, taste and odor
NSF 42 Certified
Omnipure TQ56-50FC Q5672-50FC 50 GPD encapsulated reverse osmosis membrane with flow control
Omnipure
Omnipure Q5672-50FC RO membrane 50 GPD with Flow Control
(24)
$79.99
Thin Film Membrane (TFM)
Omnipure Q5633 Q-Series GAC T33 carbon filter cartridge, 2.5 x 12 inch, for pre- or post-RO filtration
Omnipure
Omnipure Q5633 Granular Carbon Filter GAC T33 2.5" x 12"
(31)
$24.99
NSF 42 Certified
Reduces chlorine, taste and odor
PuROTwist 4000 replacement kit with three cartridges and three O-rings, without a membrane
ESP Water
PuROTwist 4000 Compatible RO Replacement Filter Kit - No Membrane
(20)
$73.97
PuROTwist 4000 replacement kit with four cartridges and four O-rings, including the membrane
Free Shipping
ESP Water
PuROTwist 4000 Compatible RO Replacement Filter Kit with 50 GPD Membrane
(44)
$160.68
Omnipure H-118 large 1-inch replacement O-ring for Q-Series filter heads
Omnipure
Omnipure H-118 Large O-Ring for Q-Series Filter Heads
(19)
$0.99
Omnipure H-011 small 3/8-inch replacement O-ring for Q-Series filter heads
Omnipure
Omnipure H-011 Small O-Ring for Q-Series Filter Heads
(20)
$0.69
PuROTwist PTKIT-RO4 maintenance kit with reusable Q-Series housings and sanitizer packet for PT4000 RO systems
ESP Water
PuROTwist PT4000 RO Sanitizing Kit PTKIT-RO4
(10)
$52.95
ASV-2000W reverse osmosis automatic shutoff valve with 1/4-inch quick-connect fittings for PuROTwist systems
ESP Water
ASV-2000W RO Automatic Shutoff Valve, 1/4 in Quick-Connect, for PuROTwist
(7)
$15.99

Replacement filter info

Your replacement schedule

Each stage of the PuROTwist PT4000 TFC 50 GPD, the exact part that fits it, and when to change it.

  1. Stage 1: Sediment filter

    Part Q5605, Omnipure Q5605 Sediment Filter 5 Micron 2.5" x 12" $23.99

    Every 6–12 months

  2. Stage 2: Carbon block filter

    Part Q5621, Omnipure Q5621 Carbon Block Filter 10 Micron 2.5 " x 12" $24.99

    Every 6–12 months

  3. Stage 3: RO membrane

    Part TQ56-50FC, Omnipure Q5672-50FC RO membrane 50 GPD with Flow Control $79.99

    Every 2 years

  4. Stage 4: Carbon block filter

    Part Q5633, Omnipure Q5633 Granular Carbon Filter GAC T33 2.5" x 12" $24.99

    Every 6–12 months

  5. Kit: Filter kit, without membrane

    Part YS-PURO4T50, PuROTwist 4000 Compatible RO Replacement Filter Kit - No Membrane $73.97

    Every filter except the membrane

  6. Kit: Filter kit, all stages

    Part YSM-PURO4T50, PuROTwist 4000 Compatible RO Replacement Filter Kit with 50 GPD Membrane $160.68

    Every filter and the membrane in one box

Manuals & instructions

Manuals and guides

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