★★★★★ 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...

RO Systems International COM800S

Reverse osmosis system

RO Systems International COM800S Replacement Filters

The COM800S Reverse Osmosis Compact I Light Commercial System is designed to treat 850+ gallons per day. The 4-stage system is made for light commercial applications and features filter pressure gauges to monitor water pressure throughout the system, a storage tank pressure switch to prevent tank overflow and a motorized pump to maximize system output.

See the replacement schedule

Compatible parts

Everything that fits the RO Systems International COM800S

Ready Water RW-SED2510050 5-micron sediment filter, direct replacement for 93023 and PX05-9 7/8
Top Seller
Ready Water
Ready Water RW-SED2510050 Sediment Filter 5 Micron 2.5" x 10"
(89)
$8.99
Meets FDA requirements for food and beverage contact
Omnipure OMB934-5m 5-micron carbon block filter for standard 10-inch water filter housings
Omnipure
Omnipure OMB934-5m Carbon Block Filter 5 Micron 2.5" x 10"
(83)
$14.99
Reduces chlorine, taste and odor
NSF Certified performance
USA made compression molded
2.5" Drop-in carbon block element
AXEON HF1 - 4021 RO Membrane 150 PSI 1000 GPD 200378 200378 - ESP Water
Free Shipping
AXEON
AXEON HF1-4021 RO Membrane 1000 GPD, 150 PSI, 4 x 21 Inches, 200378
(1)
$271.00
Thin Film Membrane (TFM)
AXEON HF4 - 4021 RO Membrane 100 PSI 1000 GPD 4" x 21" 200390 200390 - ESP Water
Free Shipping
AXEON
AXEON HF4-4021 RO Membrane 100 PSI 1000 GPD 4" x 21" 200390
(0)
$277.00
Thin Film Membrane (TFM)
AXEON HF5 - 4021 RO Membrane 80 PSI 1000 GPD 4 x 21 Inch 200393 200393 - ESP Water
Free Shipping
AXEON
AXEON HF5-4021 RO Membrane 80 PSI 1000 GPD 4 x 21 Inch 200393
(3)
$282.00
Thin Film Membrane (TFM)
AXEON NF3 - 4021 RO Membrane 1000 GPD, 4"x21", 70 PSI, 200405 200405 - ESP Water
Free Shipping
AXEON
AXEON NF3-4021 RO Membrane 1000 GPD, 4"x21", 70 PSI, 200405
(0)
$299.00
Thin Film Membrane (TFM)
AXEON NF4 - 4021 RO Membrane 950 GPD, 950 PSI, 4 x 21 Inches, 200411 200411 - ESP Water
Free Shipping
AXEON
AXEON NF4-4021 RO Membrane 950 GPD, 70 PSI, 4 x 21 Inches, 200411
(0)
$299.00
Thin Film Membrane (TFM)
AXEON HF3 - 4021 RO Membrane 900 GPD 4 x 21 Inches, 200372 200372 - ESP Water
Free Shipping
AXEON
AXEON HF3-4021 RO Membrane 900 GPD, 225 PSI, 4 x 21 Inches, 200372
(0)
$289.00
Thin Film Membrane (TFM)

Replacement filter info

Your replacement schedule

Each stage of the RO Systems International COM800S, the exact part that fits it, and when to change it.

  1. Stage 1: Sediment filter

    Part RW-SED2510050, Ready Water RW-SED2510050 Sediment Filter 5 Micron 2.5" x 10" $8.99

    Every 6–12 months

  2. Stage 2: Carbon block filter

    Part OMB934-5m, Omnipure OMB934-5m Carbon Block Filter 5 Micron 2.5" x 10" $14.99

    Every 6–12 months

  3. Stage 3: Carbon block filter

    Part OMB934-5m, Omnipure OMB934-5m Carbon Block Filter 5 Micron 2.5" x 10" $14.99

    Every 6–12 months

  4. Stage 4: RO membrane

    Part 200378, AXEON HF1-4021 RO Membrane 1000 GPD, 150 PSI, 4 x 21 Inches, 200378 $271.00

    Every 2 years

  5. Alternative for stage 4: RO membrane

    Part 200390, AXEON HF4-4021 RO Membrane 100 PSI 1000 GPD 4" x 21" 200390 $277.00

    Every 2 years

  6. Alternative for stage 4: RO membrane

    Part 200393, AXEON HF5-4021 RO Membrane 80 PSI 1000 GPD 4 x 21 Inch 200393 $282.00

    Every 2 years

  7. Alternative for stage 4: RO membrane

    Part 200405, AXEON NF3-4021 RO Membrane 1000 GPD, 4"x21", 70 PSI, 200405 $299.00

    Every 2 years

  8. Alternative for stage 4: RO membrane

    Part 200411, AXEON NF4-4021 RO Membrane 950 GPD, 70 PSI, 4 x 21 Inches, 200411 $299.00

    Every 2 years

  9. Alternative for stage 4: RO membrane

    Part 200372, AXEON HF3-4021 RO Membrane 900 GPD, 225 PSI, 4 x 21 Inches, 200372 $289.00

    Every 2 years

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+