The Everpure EV985550 doesn't last forever. Once it passes its rated capacity water still flows normally but filtration performance starts to drop.
The EV985550 is the replacement cartridge built for the Everpure EF-6000 Full Flow Drinking Water System, delivering the filtration performance Everpure specifies for the EF-6000 line through the kitchen tap you already have — no separate dispensing faucet required.
Below, you'll find out exactly when it's time to swap the cartridge, how to make sure you're buying the right one for your setup, and a full walkthrough of the replacement itself.
Why & When You Should Replace the Filter
Inside the EV985550 cartridge, the filtration media has a fixed capacity for binding chlorine, lead, and sediment. Once that capacity is used up, water still flows through normally, but the filtration performance behind it quietly drops off. That's when the cartridge stops delivering the chlorine taste & odor reduction, lead reduction, and cyst reduction covered by its NSF/ANSI 42 & 53 certification, along with the microplastics and emerging-contaminant reduction covered under NSF/ANSI 401 — the combination that makes the EF-6000 system worth having in the first place.
Everpure specifies replacing the EV985550 annually or at 6,000 gallons (22,713 L) of rated capacity, whichever happens first. A few practical signs it's time:
- You've hit the 6,000-gallon mark
- It's been roughly a year since the last change
- Water flow at the kitchen tap has slowed noticeably
- Chlorine taste or smell has started coming back
For a typical household running water through the tap daily for drinking and cooking, one of these usually lines up close to the one-year point. Two things can shorten that window:
- Heavier household usage — larger households or high daily draw run through the 6,000-gallon capacity faster than a calendar would suggest
- Poorer incoming water quality — more sediment, chlorine, or hardness shortens the cartridge's effective lifespan
⚠️ Note: The 6,000-gallon / annual replacement guidance comes directly from Everpure's specifications. The usage and water-quality factors above reflect general industry practice, not manufacturer-published data.
Everpure EV985550 Specifications
The Everpure EV985550 is a quick-change replacement cartridge built for the EF-6000 Full Flow Drinking Water System. It's certified under NSF/ANSI 42 for chlorine taste & odor and particulate reduction, NSF/ANSI 53 for health-effects claims including lead and cyst reduction, and NSF/ANSI 401 for reduction of emerging contaminants such as microplastics — with particle reduction down to 0.5 microns by mechanical means.
Prepare Your Replacement: Compatibility, Materials & Safety
Verify Filter & System Compatibility
The EV985550 cartridge is built for the Everpure EF-6000 filter head (system model EV985500), mounted under the kitchen sink. It's the head, not the cartridge alone, that determines whether this is the right part, so it's worth double-checking before you order. The EF-1500 (EV985850) and EF-3000 (EV985750) cartridges share the same QL3 head design but are not interchangeable with the EF-6000 — each has a different rated capacity and a different cartridge length (15", 20", and 22" mounting height respectively).
🔍 Not sure which system you have? Check the model printed directly on the filter head under the sink, or cross-reference it against the EV985550 product page here on BottleFillingStations.com. The clearest confirmation is physical fit — the cartridge lug needs to line up with the label on the head in order to lock in.
🧰 Materials
⚠️ Safety Precautions
⚠️ Note: These tools are listed in the manual under "Tools Required for Installation," which covers setting up the EF-6000 system/head itself. The cartridge swap covered in this guide does not require tools — just the quick quarter-turn twist.
Step-by-Step Replacement Guide
⚠️ Note: Steps above reflect Everpure's official EF-Series Installation and Operation Manual. The manual's step-by-step instructions specify a 5-minute flush — the BFS product listing's own "How to Replace" summary states 3 minutes, which conflicts with the manual and is not used here.
Signs Your New Filter Is Not Installed Correctly
If something feels off after a replacement, run through these common installation issues first:
- Leaking at the head or elbow fittings — usually means the cartridge lug isn't fully aligned or seated. Pull it back out, realign the lug with the head label, reinsert, and turn a full 1/4 turn clockwise until it locks.
- Low or no water flow — check that the QC valve handle on the head is fully lowered, and that the cold water supply valve is fully reopened.
- Cartridge won't lock into place — almost always a lug/label misalignment, or the cartridge wasn't pushed all the way up before turning the 1/4 turn stop.
⚠️ Note: These are general troubleshooting patterns based on standard EF-Series installation behavior, not official manufacturer fault codes.
What to Expect After Installing the New Filter
Give the new EV985550 cartridge its full 5-minute flush before judging performance. Here's what's normal during and right after that window:
- Air bubbles & sputtering — trapped air working its way out as the initial flush runs.
- Cloudy water — harmless loose carbon fines from the new cartridge, cleared by the flush. If cloudiness is still there after a week, contact Pentair Technical Support.
- Flow returns to normal — once flushing is done, the tap should be back to its rated 1.67 gpm.
- Taste and odor improve — any leftover chlorine taste from the old cartridge should fade within the first few uses post-flush.
If cloudiness, sputtering, or weak flow is still happening well past the flush, double-check that the cartridge is turned fully into its locked position and that the cold water supply valve is completely open.
Official Installation Reference
For the full manufacturer instructions, including diagrams and specifications, refer to the official documents below:
Maintenance Tips for Longer Filter Life
A handful of simple habits keep every EV985550 cartridge performing at its certified level for its full lifespan:
- Log every replacement date — track it against the schedule covered in the Why & When section above, since capacity, calendar time, and flow rate all factor in.
- Stay within the rated operating range — 35–100°F cold water only; running outside that range can shorten cartridge life or reduce filtration performance.
- Don't ignore a slowing tap — reduced flow is often the earliest sign the cartridge is nearing end-of-life, ahead of the schedule covered in the Why & When section above.
Where to Buy Genuine Everpure EV985550
Off-brand or "compatible" aftermarket cartridges aren't manufactured or certified by Everpure, so a genuine cartridge is the way to keep the fit and certification this system was designed around.
To help ensure performance, purchase the Everpure EV985550 Cartridge from a trusted, verified source. Everpure recommends genuine cartridges to ensure proper fit and the stated NSF/ANSI 42, 53 & 401 certifications. If you'd rather save while still getting an authentic cartridge, we also offer an open-box EV985550 option — the cartridge itself is unused and covered by the manufacturer warranty, with only the outer packaging or canister showing light cosmetic wear.
Troubleshooting & FAQ
The new EV985550 cartridge is leaking — what's wrong?
The cartridge lug likely isn't fully aligned or seated. Remove it, realign the lug with the head label, reinsert fully, and turn a full 1/4 turn clockwise until it locks into place. Also check the elbow fittings for a loose connection.
The old cartridge is hard to remove.
Confirm the QC valve handle on the head is fully lifted to stop water flow to the cartridge. Then turn the cartridge a firm 1/4 turn counterclockwise to release it from the head.
Flow is slow after replacing the EV985550 cartridge.
This usually means the cartridge isn't turned fully into its locked position, or the cold water supply valve isn't fully open. Run the full flush (see the Step-by-Step Replacement Guide above) and recheck both.
I bought a filter labeled EF-1500 or EF-3000 — will it work in my EF-6000?
No. The EF-1500 uses cartridge EV985850 and the EF-3000 uses EV985750 — neither is interchangeable with the EF-6000's EV985550, even though all three share the same QL3 head design. Each cartridge has a different capacity and length. Using the wrong cartridge may not seat properly and won't carry the same certification profile as the one your system was designed for. Always confirm the cartridge model matches your system before installing.
How often should I replace the Everpure EV985550?
See the Why & When section above for the full replacement schedule.
What system uses the EV985550 cartridge?
The EV985550 fits the Everpure EF-6000 Full Flow Drinking Water System (head/system model EV985500). It's designed for residential use and delivers filtered water through the existing kitchen tap — no dedicated drinking faucet required.
Related Products
Complete your EF-6000 setup or stock up with these compatible options:
The complete under-sink filter head and system that the EV985550 cartridge installs into — for a new setup or a full system replacement.
View Product →The EV985550 cartridge in an open-box 6-pack — packaging may show light wear, but each cartridge is unused and fully covered by the manufacturer warranty. A convenient way to stock up ahead of your next few changes.
View Product →The same genuine EV985550 cartridge at a lower price — packaging may show light wear, but the cartridge itself is unused and fully covered by the manufacturer warranty.
View Product →Conclusion
Replacing the Everpure EV985550 EF-6000 Cartridge is a quick, straightforward task — six steps, a few minutes, and no tools needed for the swap itself.
Stick to the schedule covered above, log every cartridge change, and keep a genuine EV985550 on hand so you're always ready for the next swap. It's a simple way to help keep your household's drinking water tasting clean and reduce the contaminants listed on the system's performance data sheet.