Compatibility check
Confirm This Fits Your System
Check your ProLine system before ordering so you can choose with confidence.
Compatible with
- ProLine EZ-550
- ProLine Plus 5-Stage
Not compatible with
- ProLine EZ-450
- ProLine Plus 4-Stage
- ProLine QC® Tankless RO System
Not sure which system you have?
Send us a photo of your current system or filter label and we’ll help confirm the correct replacement before you order.
Contact UsBuying guide
Which 5-Stage Package Should I Choose?
Choose the option that best matches your ProLine EZ-550 or ProLine Plus 5-Stage maintenance needs.
Complete Kit with Membrane
Best for a full system refresh when you want to replace both the filters and RO membrane.
Filter Kit Only
Best for routine maintenance when your membrane is still performing well.
Membrane Only
Best when water flow slows or RO performance drops, but your filters do not need replacing.
Not sure which option you need? Contact us and we’ll help confirm the right product before you order.
Contact UsProduct details
What’s Included With Your 5-Stage Replacement Kit
Choose the replacement option that matches your ProLine 5-stage system maintenance needs.
Kit Options
- Complete kit with membrane option
- Filter kit only option
- Membrane only option
- Designed for ProLine EZ-550
- Also supports ProLine Plus 5-Stage systems
When to Replace
- Use the complete kit for a full system refresh
- Use the filter kit only for routine filter maintenance
- Use membrane only when RO performance slows
- Replace sooner if taste, odor, or flow changes
- Contact us if you are unsure which option fits
Not sure if you need the complete kit, filters only, or membrane only? Send us a photo and we’ll help confirm.
Contact UsMaintenance guide
How Often Should I Replace 5-Stage Filters?
Use this guide to understand when to replace filters or membrane components for your ProLine 5-stage system.
Routine Filter Changes
Use the filter kit only option for regular maintenance when your RO membrane is still performing well.
Full System Refresh
Choose the complete kit with membrane when you want to refresh both filters and membrane together.
Membrane Only Replacement
Choose membrane only when RO performance or water flow changes but your other filters do not need replacing.
For ProLine EZ-550 and ProLine Plus 5-Stage systems, choose the package that matches your maintenance needs.
FAQs
5-Stage Replacement Kit FAQs
Helpful answers for ProLine EZ-550 and ProLine Plus 5-Stage replacement kits.
Does this fit my ProLine 5-stage system? +
This kit is designed for ProLine EZ-550 and ProLine Plus 5-Stage systems. If you are unsure, contact us before ordering.
Should I buy the complete kit or filter kit only? +
Choose the complete kit if you want to replace both filters and membrane. Choose filter kit only for routine filter maintenance when your membrane is still performing well.
When do I need the membrane only option? +
Choose membrane only when RO performance or water flow changes but your other filters do not need replacing.
Is this compatible with the EZ-450? +
No. If you have a ProLine EZ-450 or ProLine Plus 4-Stage system, choose the 4-stage replacement kit instead.
Can you help me choose the right option? +
Yes. Send us a photo of your system or filter label and we will help confirm the correct replacement package.
Contact us with your system model or a photo of your setup and we’ll help confirm the right product.
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.
“The ProLine QC® system was compact, clean-looking, and made a noticeable difference in taste right away.”
“It was easy to find the correct QC® filters and refresh the system without overthinking which cartridges I needed.”
“The guide made it clear that my EZ-450 needed the 4-stage kit. Much easier than buying filters one by one.”
“Having the full 5-stage kit together made replacement simple. I knew I had the right filters before ordering.”
“I sent a quick photo of my system and Stratus helped confirm the correct replacement kit before I bought.”
“The product page was clear, shipping was quick, and replacing the filters was straightforward.”
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 UsSend 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.
