Reverse Osmosis Replacement Filters | Single RO Filter Cartridges – Filter United

Skip to content

Autoship & Save: Automate and Stay Fresh. Always 15% Off on Autoship Filters.

Free Shipping on Orders $35+

Shop
Reverse Osmosis Systems
VIVA21 5-Stage RO System
VIVA21 6-Stage Alkaline RO System
Replacement Filters & Parts
Filter Sets
Single Filters
Parts & Accessories

VIVA21 RO System
Autoship

About Us
Support

Filter United

Shop
- Reverse Osmosis Systems
  
  VIVA21 5-Stage RO System
  VIVA21 6-Stage Alkaline RO System
- Replacement Filters & Parts
  
  Filter Sets
  Single Filters
  Parts & Accessories
Autoship
About Us
Support

Log in

Facebook
Instagram
YouTube

Home Collection Reverse Osmosis System Single Filter Replacements

Availability

In stock(9)
Out of stock(0)

Price

From To

From $

To

To $

Filter

Sort by:

Availability

In stock(9)
Out of stock(0)

Price

From To

From $

To

To $

9 products

Sort by:

High Capacity Alkaline Water Filter Replacement - V21RFPH | 10 Inch Compatible with All Traditional RO Systems

High Capacity Alkaline Water Filter Replacement - V21RFPH | 10 Inch Compatible with All Traditional RO Systems

High Capacity Alkaline Water Filter Replacement - V21RFPH | 10 Inch Compatible with All Traditional RO Systems

Regular price $49.99

Sale price Regular price

Unit price

/per

Inline Post Carbon Water Filter Replacement - V21RFPC10 | 10 Inch Compatible with All Traditional RO Systems

Inline Post Carbon Water Filter Replacement - V21RFPC10 | 10 Inch Compatible with All Traditional RO Systems

Regular price $24.99

Sale price Regular price

Unit price

/per

100GPD Reverse Osmosis Membrane Replacement - V21RM100 | 10 Inch Compatible with All Traditional RO Systems

100GPD Reverse Osmosis Membrane Replacement - V21RM100 | 10 Inch Compatible with All Traditional RO Systems

Regular price From $39.99

Sale price Regular price

Unit price

/per

75GPD Reverse Osmosis Membrane Replacement - V21RM75 | 10 Inch Compatible with All Traditional RO Systems

75GPD Reverse Osmosis Membrane Replacement - V21RM75 | 10 Inch Compatible with All Traditional RO Systems

Regular price From $39.99

Sale price Regular price

Unit price

/per

UV Ultraviolet Light Water Filter Replacement - V21UVLED | 10 Inch Compatible with All Traditional RO Systems

UV Ultraviolet Light Water Filter Replacement - V21UVLED | 10 Inch Compatible with All Traditional RO Systems

Regular price $89.99

Sale price Regular price

Unit price

/per

5 Micron Granular Activated Carbon Filter Replacement - V21RFG2510 | 10 Inch Compatible with All Traditional RO Systems

5 Micron Granular Activated Carbon Filter Replacement - V21RFG2510 | 10 Inch Compatible with All Traditional RO Systems

Regular price $19.99

Sale price Regular price

Unit price

/per

50GPD Reverse Osmosis Membrane Replacement - V21RM50 | 10 Inch Compatible with All Traditional RO Systems

50GPD Reverse Osmosis Membrane Replacement - V21RM50 | 10 Inch Compatible with All Traditional RO Systems

Regular price From $39.99

Sale price Regular price

Unit price

/per

5 Micron Carbon Block Water Filter Replacement - V21RFC2510 | 10 Inch Compatible with All Traditional RO Systems

5 Micron Carbon Block Water Filter Replacement - V21RFC2510 | 10 Inch Compatible with All Traditional RO Systems

Regular price $19.99

Sale price Regular price

Unit price

/per

5 Micron Sediment Water Filter Replacement - V21RFS2510 | 10 Inch Compatible with All Traditional RO Systems

5 Micron Sediment Water Filter Replacement - V21RFS2510 | 10 Inch Compatible with All Traditional RO Systems

Regular price $12.99

Sale price Regular price

Unit price

/per

About

We believe in our products. Certified to the highest standards along with our experience in water filtration industry, Filter United delivers unmatched experience and protects your family from water impurities.

Learn more

Shop

Search
Home
Autoship
VIVA21 5-Stage RO System
VIVA21 6-Stage Alkaline RO System
Single Filters
Filter Sets
Parts & Accessories

Customer Care

About Us
Blogs
Contact Us
FAQs
Privacy Policy
Reward Program
Shipping and Return Policy
Terms and Conditions
Warranty Registration
Your Privacy Choices
2026 FIFA World Cup Free Gift Poll

Facebook
Instagram
YouTube

© 2026 Filter United . Powered by Shopify

Payment methods

Your cart

You are eligible for free shipping. Spend $0.00 more to reach free shipping!

Your cart is currently empty.

Not sure where to start?
Try these collections:

Continue shopping

Order note

Order note

Estimate Shipping

Country/region

Province

Postal/ZIP code

Coupon

Coupon

Estimated total $0.00 USD

Taxes and shipping calculated at checkout

View cart

Search

Search

Choosing a selection results in a full page refresh.
Opens in a new window.