Finding the exact replacement water filter cartridge

Advertised prices, verified

Identifying your cartridge, best evidence first

1. Start from the system's model number. The model on the housing cap, head, or manual is the strongest identifier, because the maker publishes exactly which cartridges each model takes. Search that number before measuring anything; it settles size, media, and seal style in one step and rules out lookalikes.
2. Read the spent cartridge itself. Most cartridges carry their own part number and rating printed on the wrapper or end cap. Copy it down before the old one goes in the trash, and photograph the label too, because that photo is what makes reordering next year a one-minute job instead of a fresh investigation.
3. Measure only when the labels are gone. With no numbers to go on, measure the cartridge's length and diameter, note whether the ends are open, gasketed, or fitted with a molded cap, and identify the media by its build: string-wound or pleated for sediment, a solid block or granular fill for carbon. A vendor can match from that.
4. Confirm the rating, not just the fit. Two cartridges of identical size can filter very differently, so match the media type and the rating printed on the old cartridge or in the manual, coarser for high sediment loads, finer for polishing. Fit gets the sump closed; the rating is what decides whether the water is actually treated.

The lookalike trap

Standard housings created a standard cartridge shape, and that shape now carries every media the industry makes: sediment string, pleated washable, carbon block, granular carbon, iron-reduction media, and blends. A cartridge that slides onto the standpipe perfectly can still be the wrong tool entirely, which is why identification runs on numbers and labels rather than on eyeballing the shelf.

The same trap runs in reverse for proprietary quick-change systems, where third-party cartridges advertise compatibility with a popular head. Some are fine, but the seal is the risk point, and a slow leak inside a cabinet costs more than years of branded cartridges. Weigh that using the price gap the table below makes explicit.

Turning identification into a routine

Once the right cartridge is confirmed, freeze the decision: write the part number on the housing with a marker, keep the label photo with your house documents, and order two so a spare always sits next to the system. Every future change then starts from the answer instead of the question.

If the correct cartridge keeps failing early, stop reordering and rediagnose, because early failure means the water changed or was never matched to the media in the first place. Our well water testing guide covers finding out what the cartridge is actually being asked to remove.

Common questions

Can I match a cartridge from a photo alone?

Often, if the photo shows the printed label or end cap clearly. A shape-only photo narrows it to a size class but not the media or rating, so include the housing cap's model number in the shot when you can.

Are washable cartridges worth it?

Pleated washable sediment cartridges make sense on gritty well water where disposables clog fast. They only handle sediment though; carbon and specialty media exhaust chemically and cannot be rinsed back to life.

What should a replacement cartridge cost?

Standard sizes are commodity priced and proprietary formats carry a premium. The table on this page tracks current prices across the vendors we monitor, with a typical cartridge near $1,531.

The new cartridge fits but water tastes different. Why?

You likely received a different media or rating in the same shell, or the new carbon simply needs flushing. Flush thoroughly first; if the difference persists, compare the new label against the old part number.

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