AP904 specs
| Brand | Aqua-Pure |
|---|---|
| Service flow rate | 20 GPM |
| Media capacity | 100,000 gal |
| Filter media | Carbon-activated filter block with scale-inhibition media (per seller) |
| Filter life | 100,000 gal (Forbes notes some customers report less) |
| Certifications | NSF/ANSI 42 (per Forbes Home) |
| Best for water type | City (municipal) water |
| Warranty | 25-year limited (per aquapurefilters.com and Forbes Home) |
| Annual filter cost | Varies — check the maker page |
| Price | $ Budget (under ~$600) — ~$411–$485. See Amazon for today's price. |
- Product page title changed from 3M Aqua-Pure to Aqua-Pure (aquapurefilters.com).
- Forbes: NSF 42 is the lowest certification level.
Specs are compiled from manufacturer listings and may change between production runs. Confirm on the retailer page before buying.
The Aqua-Pure AP904 (sold under the 3M Aqua-Pure name in older reviews) is a cartridge-based whole-house system with scale reduction, aimed at improving taste and odor and reducing sediment and scale. Better Homes & Gardens tested it hands-on and named it best overall, and Forbes Home rated it 4.5. Neither review treats it as a filter for iron or lead. Check today’s price.
Who the Aqua-Pure AP904 is for (and who should skip it)
It suits a city-water home that wants better taste, less chlorine and some protection from scale in appliances, at a lower price than a tank system. Forbes Home highlighted its 20 GPM flow rate, 100,000 gallon cartridge capacity and 25 year warranty, and noted its lower price than competitors.
Skip it if:
- You have iron, manganese or heavy metals in your water. BHG says it does not remove iron or lead. See well-water iron and manganese and the SpringWell LCR.
- You want PFAS or fluoride reduction. Neither review claims it. See PFAS filter guide.
- You want a set-and-forget tank. Cartridges need regular replacement. See five-year maintenance cost.
Filtration performance
Forbes Home says the AP904 has NSF/ANSI 42 certification, the lowest certification level, which covers chlorine and taste and odor, not health contaminants, and that the filter is carbon-activated. BHG says it used water test kits to test water before and after installing each filter. Its note on the AP904: “It improved the taste of our water and helped remove sediment that causes buildup on faucets.” The seller’s page describes scale-inhibition media that reduces scale formation in appliances.
Flow rate and pressure
Forbes Home lists a 20 GPM flow rate and rates flow as excellent. Pressure depends on your plumbing, so run your numbers through our flow sizer.
Installation and maintenance
We could not verify BHG’s installation notes for this unit. Forbes Home lists a 100,000 gallon cartridge capacity and says customers report shorter life in some homes. Plan for a bypass loop and a cartridge budget. See installation cost.
Cost of ownership
BHG listed $485 at Amazon, $420 on sale, and $411 to $426 at specialist sellers. aquapurefilters.com lists $431.99 as of 2026-10-12. We do not have a verified replacement-cartridge price, so budget by checking the seller before buying.
How the Aqua-Pure AP904 compares
| AP904 | SpringWell CF1 | Express Water Heavy Metal | iSpring WGB32B | |
|---|---|---|---|---|
| Flow | 20 GPM (Forbes) | 9 GPM | 15 GPM | 15 GPM |
| Capacity | 100,000 gal | 1,000,000 gal | 100,000 gal | 100,000 gal |
| Media | Carbon block + scale inhibition | Catalytic carbon + KDF | KDF + anti-scale + carbon | 3-stage Big Blue |
| Warranty | 25 years (Forbes) | Lifetime on tank, valves, housings | 1 year | 1 year |
| Price | about $411 to $485 | $1,144 to $1,160 | $548 to $550 | $420 to $517 |
See the SpringWell CF1, Express Water, iSpring WGB32B and our 2026 roundup.
Bottom line
A low-cost, high-flow cartridge system that two major outlets rate well for taste, sediment and scale, with clear limits: no iron, no lead, and cartridge life that varies. A good fit for a city-water home on a budget. Check today’s price.
Check the current price on Amazon
