Authorized ProLine® Distributor

Find the Right ProLine® System or Replacement Filter

Shop ProLine QC® systems, QC replacement filters, and full replacement kits for compatible ProLine® 4-stage and 5-stage systems.

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ProLine reverse osmosis systems and replacement filters

Step 1: Select your system or filter

Shop by Need

Choose your ProLine system or replacement filter kit below. Not sure what fits? Use the guide below or contact us.

ProLine QC® System

ProLine QC® System

Tankless reverse osmosis system for clean, great-tasting water.

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QC® Replacement Filters

QC® Replacement Filters

Replacement filters for ProLine QC® tankless RO systems.

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4-Stage Replacement Kit

4-Stage Replacement Kit

Fits ProLine EZ-450 and ProLine Plus 4-Stage systems.

Shop 4-Stage Kit
5-Stage Replacement Kit

5-Stage Replacement Kit

Fits ProLine EZ-550 and ProLine Plus 5-Stage systems.

Shop 5-Stage Kit

Step 2: Confirm the right fit

Which Filter Do I Need?

Match your ProLine system below to find the correct replacement filter kit.

Your System Correct Product
ProLine QC® QC® Replacement Filters → ProLine EZ-450 4-Stage Replacement Kit → ProLine Plus 4-Stage 4-Stage Replacement Kit → ProLine EZ-550 5-Stage Replacement Kit → ProLine Plus 5-Stage 5-Stage Replacement Kit →

Not sure which one fits?

Send us a photo of your current system and we’ll help confirm the right replacement kit.

Contact Us

Step 3: Shop the collection

All ProLine® Products

Browse ProLine QC systems, QC replacement filters, and full replacement kits for compatible 4-stage and 5-stage systems.

Customer confidence

Trusted by Customers Maintaining Their ProLine® Systems

From choosing the right kit to keeping systems running smoothly, Stratus helps make ProLine® filter replacement simple.

ProLine QC® System
“The ProLine QC® system was compact, clean-looking, and made a noticeable difference in taste right away.”
Sofia M. Homeowner
QC® Replacement Filters
“It was easy to find the correct QC® filters and refresh the system without overthinking which cartridges I needed.”
Daniel R. Homeowner
4-Stage Kit
“The guide made it clear that my EZ-450 needed the 4-stage kit. Much easier than buying filters one by one.”
Priya K. Homeowner
5-Stage Kit
“Having the full 5-stage kit together made replacement simple. I knew I had the right filters before ordering.”
Marco D. Installer
Support
“I sent a quick photo of my system and Stratus helped confirm the correct replacement kit before I bought.”
Olivia W. Homeowner
Fast Shipping
“The product page was clear, shipping was quick, and replacing the filters was straightforward.”
Ryan S. Installer

Expert support

Need Help Choosing the Right Filter?

Not sure which ProLine system you have? Send us a photo of your current unit and we’ll help confirm the correct replacement kit before you order.

Contact Us

Send a Photo

Share a quick photo of your current system or existing filters.

We Confirm the Match

We’ll help identify whether you need QC filters, a 4-stage kit, or a 5-stage kit.

Order With Confidence

Get the right replacement kit the first time and avoid confusion.