Whole-House Cartridge Replacement: Three Manuals, Three Clocks

By SubcontractorHub Editorial Team·Published November 2026

Homeowners hear "change the filter" as if every blue sump shared one calendar. The manuals do not. This page is a whole-house cartridge replacement comparison of three files fetched on November 13, 2026. It is not the Pentair Pelican sediment housing, which already has its own article, and it is not a sizing tool.

Why a Whole-House Cartridge Replacement Is Not One Interval

Aquasana's WH-1000 pre and post filter sheet (document mark AQ-WH-1010, dated in the footer as 20221020) splits the clock by cartridge. The 20 inch pre-filter is every 2 months. The low-maintenance pre-filter is every 6 months. The 10 inch post-filter is every 6 months. Each of those lines says to replace sooner if flow through the system drops in a way you can notice. The pre and post housings themselves are every 5 years, and the sheet says to call their support line for that replacement rather than treating the housing like a cartridge.

Multipure's Aquasource manual names filter model CB20HC and gives two wordings that a technician should not flatten into one month. One bullet says replace annually, or when rated capacity is reached, or when flow diminishes, or when the filters are saturated with bad tastes and odors. A later numbered note says replace when the first of these happens: rated capacity, diminished flow, taste or odor, or every 6 to 12 months. Both sentences are in the file. This article quotes both and does not pick a winner. The housing warranty language on that page is tied to replacing filters at least once a year. That is Multipure's warranty sentence, not a universal year.

Crystal Quest's compact point-of-entry guide says to use its timetable as a guide, and that consumption and water condition can make the change sooner. Sediment about every 12 months. GAC or carbon block about every 12 months. SMART about every 18 to 24 months. The same guide says to change the cartridge when flow is noticeably reduced, or as needed, and that changes in taste, odor, color, or flow mean the cartridge should be replaced. A 12 month line and a "when flow drops" line can both be true. The visit is whichever comes first on that sheet.

The Steps Each Sheet Actually Prints

Aquasana's sequence is for that Rhino housing. Shut the system off at shut-off valve A. Place a 5 gallon bucket under the drain valve and open the valve so pressure is relieved and excess water drains. The sheet says you must relieve pressure before a pre-filter or post-filter change. Remove the blue housing by turning the lower ring to the left with the wrench that came with the system. Remove the used filter. Wash the housing with mild soapy water if it needs it, then rinse and dry. Set the new filter in the center. Clean the O-ring, relubricate it with silicone grease, seat it, and turn the housing back to the right. Turn the system on. Run water with the bucket still under the pre-filter and check for leaks. The note says do not use petroleum jelly on the system or the O-rings.

Multipure's removal sequence is a different vessel. Close the main supply. Close the faucets so water does not flow backward. Relieve air by turning the vent nut on the lid counterclockwise until it is off. Attach a garden hose to the drainage valve and open it. Let the housing drain, then close the valve. The manual also says the housing runs upright and needs at least 22 inches of clearance above the lid for a cartridge change. Cold water only. Pressure on that page is 30 psi to 100 psi. If the system will sit 10 or more days, drain it and remove the filters. If water already sat that long, flush to waste for about 10 minutes before normal use. Do not let the housing freeze.

Crystal Quest's compact guide says cold water only, shut the water from an upstream valve or use the bypass, and do not cross-thread the housing. If you will be away more than 72 hours, put the system in bypass. After a long idle, flush 5 to 6 minutes before use. The larger Crystal Quest point-of-entry file, fetched the same day, says to wash the sump with mild soap and water, not harsh cleaners or hot water, and to seat a lightly greased O-ring. That wash step is quoted from that file. It is not Aquasana's wrench direction and it is not Multipure's vent nut. The ticket should name the manual, or the next tech will mix the steps.

What This Is Not

The blue Pentair housing with a 6 to 9 month sediment line is sediment filter replacement. That interval is for the PSE1800-P and PSE2000-P manual. Putting it on an Aquasana 20 inch pre-filter would ignore the 2 month line in Aquasana's own sheet. Putting Aquasana's 2 months on a Crystal Quest sediment cartridge would ignore the 12 month guide. The brand on the sump is the clock.

Sizing a carbon vessel is the carbon filter sizing calculator. Sizing a sediment stage is the sediment filter sizing calculator. This page does not pick a micron rating and does not estimate gallons per year. A cost model that already lives on the site is the whole-house water filter cost calculator. Its dollar assumptions are that page's. They are not copied here, and no new cartridge price is added.

A UV lamp downstream of a packed cartridge is a different failure. Lamp hours from two other manuals are UV lamp replacement. If the test says the train needs more than a cartridge, the order of stages is the well water treatment system selector. A cartridge change does not disinfect a well.

How to Log a Whole-House Cartridge Replacement

1. Write the brand and the model. These clocks are WH-1000, Aquasource CB20HC, or the Crystal Quest compact guide.
2. Write which cartridge: 20 inch pre, low-maintenance pre, post, sediment, carbon, or SMART. The months are not interchangeable.
3. Write whether the visit was the calendar or a flow, taste, or odor complaint. Each manual allows the sooner cause.
4. Write that pressure was relieved before the sump came off, in the way that manual describes.
5. Write the O-ring: cleaned, greased with what that sheet allows, and seated. Aquasana specifically rules out petroleum jelly.
6. Do not write a price. None of these fetched files printed a cartridge dollar amount that this page will repeat.

Aquasana's sheet also says the system is designed for genuine Aquasana parts, and that other manufacturers' parts may void the warranty and may hurt reduction performance. That is their warranty line. Multipure says replacement filters can be bought from Multipure and sends the reader to the website for the latest prices. Crystal Quest says the contaminants reduced by the cartridge you selected are not necessarily in the water, and points the reader at a lab or the utility for a test. A filter change without a test is a schedule, not a diagnosis.

What Was Seen and Not Used

Search also showed an iSpring whole-house PDF that said cartridges every 3 to 6 months depending on source water and use. That file was not the one read line by line for the steps above, so 3 to 6 months is not mixed into the table. Demand for this URL is from the public result list only. Ahrefs was not refreshed, so no volume is stated. No SubcontractorHub close rate is attached to a filter change.

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