★★★★★ Serving 60,000+ customers with 6,200+ five star reviews.
FILTER FINDER

What system do you have?

Brand
Select your brand...
Model
Select your model...

PuROTwist PT4000 TFC 50 GPD

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$29.99
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$28.74
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$104.99
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$31.24
NSF 42 Certified
Reduces chlorine, taste and odor
PuROTwist 4000 compatible replacement filter kit without reverse osmosis membrane
ESP Water
PuROTwist 4000 RO Replacement Filter Kit - Membrane Sold Separately
(20)
$73.97
PuROTwist 4000 compatible replacement filter kit with 50 GPD TQ56-50FC reverse osmosis membrane and O-rings
Free Shipping
ESP Water
PuROTwist 4000 RO Filter Replacement 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 O-Ring Large 1" for Q-Series Head
(19)
$0.99$1.24
Omnipure H-011 small 3/8-inch replacement O-ring for Q-Series filter heads
Omnipure
Omnipure H-011 O-Ring Small 3/8" for Q-Series Head
(20)
$0.69$0.86
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 Shut off Valve 1/4-Inch QC for PuROTwist
(7)
$15.99$19.99

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 RO Replacement Filter Kit - Membrane Sold Separately $73.97

    Every filter except the membrane

  6. Kit: Filter kit, all stages

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

    Every filter and the membrane in one box

Manuals & instructions

Manuals and guides

Focused on What Matters

Team of Trained and
Experienced Specialists
Live US-Based
Support Team
Top Rated
Service
Free Fast Shipping
On Orders $99+