Skip to content
  • Not sure which system fits your water? Book a free home assessment with Water Doctor.
  • Need replacement filters or UV lamps? Shop maintenance essentials online.
Free Assessment Water Hardness Check
Log in
  • RO Systems hot
  • Water Softeners
  • Whole-Home
  • Replacement Filters
    • RO Faucets
  • Services
  • Best Sellers
  • Support
    • FAQ
    • Warranty
    • Terms of Service
    Water Doctor Canada Inc.
    • hot RO Systems
    • Water Softeners
    • Whole-Home
    • Replacement Filters
      • RO Faucets
    • Services
    • Best Sellers
    • Support
      • FAQ
      • Warranty
      • Terms of Service
    Log in $0.00 Total $0.00 in cart
    • Home
    • Collections
    • Replacement Cartridge

    Replacement Cartridge

    Replacement matching

    Buy only if you know the exact part. Verify compatibility first if you do not.

    Verify Replacement Match
    Book System Check
    Filter
    10 products
    • Water Doctor COMO-R700 PCB replacement filter cartridge Water Doctor COMO-R700 RO replacement filter cartridge
      Pre-order

      Water Doctor COMO-R700 Replacement Filter Cartridges – PCB / RO

      ReplacementModel · 2
      Regular price From $89.99 CAD
      View details →
    • Water Doctor ROS4A quick-twist RO replacement cartridges Water Doctor ROS4A quick-twist RO replacement cartridges
      Pre-order

      Water Doctor ROS4A Replacement Filter Cartridges – PP / CTO / T33 / RO

      ReplacementModel · 4
      Regular price From $49.99 CAD
      View details →
    • Water Doctor PP sediment replacement filter cartridge Water Doctor 2.5 x 10 RO replacement filter cartridge

      Water Doctor 2.5 x 10 Replacement Filter Cartridges – PP / CTO / GAC / T33 / RO

      ReplacementModel · 5
      Regular price From $12.99 CAD
      View details →
    • Water Doctor COMO-R1000 PPC replacement filter cartridge Water Doctor COMO-R1000 ROC replacement filter cartridge
      Pre-order

      Water Doctor COMO-R1000 Replacement Filter Cartridges – PPC / ROC

      ReplacementModel · 2
      Regular price From $89.99 CAD
      View details →
    • Water Doctor GF3 800GPD PPC RO and 3C replacement filters Water Doctor GF3 800GPD PPC RO and 3C replacement filters

      Water Doctor GF3 800GPD Replacement Filters – PPC / RO / 3C

      ReplacementModel · 3
      Regular price From $70.00 CAD
      View details →
    • Water Doctor ROS4B quick-twist RO replacement cartridges Water Doctor ROS4B quick-twist RO replacement cartridges

      Water Doctor ROS4B Replacement Filter Cartridges – PP / CTO / T33 / RO

      ReplacementModel · 4
      Regular price From $49.99 CAD
      View details →
    • Water Doctor 4.5 x 10 Replacement Filter Cartridges – PP / PS / PL / CTO / GAC Water Doctor 4.5 x 10 Big Blue replacement filter cartridge

      Water Doctor 4.5 x 10 Replacement Filter Cartridges – PP / PS / PL / CTO / GAC

      ReplacementModel · 5
      Regular price From $17.99 CAD
      View details →
    • Water Doctor PP sediment replacement filter cartridge Water Doctor 4.5 x 20 Big Blue replacement filter cartridge

      Water Doctor 4.5 x 20 Replacement Filter Cartridges – PP / PS / PL / CTO / GAC

      ReplacementModel · 5
      Regular price From $28.99 CAD
      View details →
    • Water Doctor alkaline 6-stage RO replacement cartridge Water Doctor Alkaline 6-Stage Cartridge Filter

      Water Doctor Alkaline 6-Stage Cartridge Filter

      Replacement
      Regular price $250.00 CAD
      View details →
    • Water Doctor 2.5 x 20 Replacement Filter Cartridges – PP / PS / PL / CTO / GAC Water Doctor 2.5 x 20 replacement filter cartridge

      Water Doctor 2.5 x 20 Replacement Filter Cartridges – PP / PS / PL / CTO / GAC

      ReplacementModel · 5
      Regular price From $19.99 CAD
      View details →
    • About Water Doctor
      • Our Story
      • Careers
      • Blogs
      • Site Map
      About Water Doctor
      • Our Story
      • Careers
      • Blogs
      • Site Map
    • Support
      • Contact us
      • Water Assessment
      • Shipping, Refunds & Returns
      • Warranty Terms
      • Subscribe & Save
      • FAQs
      Support
      • Contact us
      • Water Assessment
      • Shipping, Refunds & Returns
      • Warranty Terms
      • Subscribe & Save
      • FAQs
    • Contact Us
      info@waterdoctor.ca
      +1 289-748-9666

      Water treatment systems, replacement parts, and expert support for homes and businesses.

    Payment methods
    • American Express
    • Apple Pay
    • Diners Club
    • Discover
    • Google Pay
    • Mastercard
    • PayPal
    • Shop Pay
    • Visa
    © 2026, Water Doctor Canada Inc. All rights reserved.
    • Privacy policy
    • Terms of service
    • Refund policy
    • Shipping policy
    Canada TOP
    Popular searches
    Water Softener all-in-one softener Symphony Symphony Lite Replacement Filters
    View cart

    Your cart is empty

    Choose the path that matches what you came to buy.

    Shop Best Sellers Shop Replacement Filters Not sure? Use Help Me Choose
    Have an account?
    Log in to check out faster.
    View details
    Are you sure?
    • Choosing a selection results in a full page refresh.
    • Opens in a new window.