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Aqua-Pure AP431 Scale Inhibition Replacement Cartridge, Easy Change High Capacity Water Filter for AP430SS

4.6 out of 5 stars 137 customer reviews
| 12 answered questions

List Price: $49.56
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  • Enter your model number above to make sure this fits.
  • Scale and corrosion inhibition helps extend life of water heaters
  • Unrestricted flow design provides up to 10 gallons (37.9 liters) per minute
  • Disposable cartridge inhibits scale for up to six months before replacement
  • Slow-dissolve rate provides consistent dosing and long cartridge life
  • When used with a system that is installed before the hot water system, the cartridge also helps protect appliances and pipes downstream
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Frequently Bought Together

  • Aqua-Pure AP431 Scale Inhibition Replacement Cartridge, Easy Change High Capacity Water Filter for AP430SS
  • +
  • Aqua-Pure AP430SS Hot Water System Protector
  • +
  • Watts LFTWH-FT-HCN Service Valve Kit for Tankless Water Heater
Total price: $153.24
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Technical Details

  • AP43111

Product Description

Product Description

If you've got A3 maqua-pure AP430 or ap430-ss hot water filter system, and you need some Replacement filters, look no further. The AP431 is the Replacement filter for your system.

From the Manufacturer

The Aqua-Pure® Replacement Cartridge AP431 for the Aqua-Pure® scale inhibition system helps protect water heaters, dishwashers, clothes washers, and plumbing from corrosion and scale build-up. The cartridge provides a good flow rate for residential and light commercial applications. A slow dissolve rate provides consistent dosing and long cartridge life.

Manufactured by 3M Purification Inc., formerly CUNO Incorporated, the Aqua-Pure AP431 Replacement Cartridge is made from FDA DVR-21 compliant materials. It fits a canister unit 10-1/4 inches (26 cm) high and 2-3/4 inches (7 cm) in diameter. Designed for use in a cold-water line before the water heater system, the cartridge will operate at temperatures up to 100°F (37.8°C) and at water pressure up to 125 psi (862 kPa). It has a flow rate of up to 10 gallons (37.9 liters) of water per minute. The cartridge should be replaced every six months at a minimum. It is for use with Aqua-Pure AP430SS Scale Inhibitor System.

According to the U.S. Geological Survey, over 70% of U.S. water supplies are designated as hard to very hard (containing elevated levels of calcium, magnesium, or both).* A visible indication of hard water is the appearance of white spots on faucets, shower doors and dishware. A less visible but more serious problem is build-up of lime and other minerals on plumbing fixtures and appliances that use water—especially water heaters. This build-up, or scale, can result in damage to fixtures and appliances, shortening their useful life. If your water is hard, Aqua-Pure® AP430SS Scale Inhibition System may provide economical, efficient protection.

For more than a century, 3M has applied innovation and technology to improving our customers’ lives and supporting their business goals. Today the company, from its headquarters in St. Paul, Minnesota, serves industrial and commercial customers and consumers in nearly 200 countries. 3M Purification Inc. (formerly CUNO Incorporated), provides filtration and separation solutions for food service, science labs, residential, marine, and other applications. The 3M brand, across thousands of products, represents consistency, superior quality, and value.


Product Information

Technical Details

Part Number AP431
Item Weight 1 pounds
Product Dimensions 2.8 x 2.8 x 13 inches
Origin USA
Item model number AP431
Color White
Item Package Quantity 1
Flow Rate 37.9 liters_per_minute
Special Features AP43111
Batteries Included? No
Batteries Required? No
Warranty Description 1 year limited warranty

Additional Information

ASIN B00115USHS
Customer Reviews
4.6 out of 5 stars 137 customer reviews

4.6 out of 5 stars
Best Sellers Rank #2,020 in Home Improvements (See top 100)
#13 in Home Improvement > Kitchen & Bath Fixtures > Water Filtration & Softeners > Replacement Filters > Replacement Under-Sink Filters
Shipping Weight 1.1 pounds (View shipping rates and policies)
Domestic Shipping This item is also available for shipping to select countries outside the U.S.
International Shipping This item is not eligible for international shipping. Learn More
Date First Available November 9, 2004

Warranty & Support

Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

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From the Manufacturer

AP431 AP430SS
Replacement System System & AP431 Filter
Reduction Claim Scale Scale
Replacement Interval Up to 6 Months Up to 6 Months
Filter Type‎ Quick Change Cartridge‎ Quick Change Cartridge‎
Flow Rate‎ (Gallons Per Mintue) 10 GPM 10 GPM
Pressure Range‎ 25 - 125 psi‎ 25 - 125 psi‎
Part Number/3M ID AP43111 / 70020319276 AP43010 / 70020003060

Customer Questions & Answers

Customer Reviews

Top Customer Reviews

This is a great product and at a great price. This is a simple option for hard water, without all the negatives of water softeners. Basically, instead of dumping a bunch of salt into an expensive water softener twice a year, this product introduces a bit of polyphosphate into the hot water feed, typically before an instant water heater (boiler in our case). The polyphosphate prevents scale buildup on the heat exchanger, which is what a water softener does, at a fraction of the cost, and without the slimy feel of softened water
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Have been using this system for two years now. After my new water heater was in service for a year I completely drained it and found very very little scaling. Also have no scaleing anywhere in plumbing system. We use on average 9 thousand gallon of water bi-monthly X 6 = 54,000 of water treatment from one Aqua-Pure AP431 Scale Inhibition Cartridge.
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My first two tankless water heaters did not have this device - I learned the hard way that there is calcium or lime (or both) in my water here, and it destroyed the canisters in the first two heaters. They cracked and the corrosion was evident on their exterior surfaces. For my third tankless, I had the plumber install a T-pipe where this filter is installed. I've used them for the past year or so, changing them every 6 months. It's like insurance for the heater. So far, so good!
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I have a pre-filter setup on the inlet flow of my tankless water heater. It was recommended by the installers of my water heater to descale the unit every 2 years. I have replaced this scale inhibition filter twice now and descaled the unit only once. This filter does help reduce the scale build up, but based on my descaling a couple of months ago, I think I need to replace this filter every 9 months instead of every 12 due to my hard water. (Or descale my water heater annually instead of by annually.) Long story short, my water heater still works great and wasn't too scaley when I cleaned it.)
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I bought this to put in front of my on demand water heater, figuring that keeping the calcium off the elements would prolong its life. The filter works well, and I can definitely feel the difference between the filtered and unfiltered water in the shower.
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It's hard to really say how well it works because until something happens you just assume it is working. So far, so good. I have an electric demand-type water heater and was concerned about the build-up of mineral deposits inside the heater. I put this inline and before the heater and have had no problems since installation which was a couple of years ago. I live alone and change the cartridge every 9 or 10 months. I have not seen any scale or mineral deposits on my faucets, so I assume the internal parts of the heater are also clean. Time will tell.
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One of the best scale reducers on the market. Can not beat the price on line. Almost 1/2 what a plumber or furnace repair guy would charge you.
Basically it prevents scale (chemical coating) from forming in your hot water heating system. Unless you want to pay a couple of hundred dollars to have your hot water heating system flushed with acid.
A typical cartridge will last almost a year (comes with a life indicator), and best; once the hardware is installed... you can change it your self or have the burner service guy change it when he does the annual burner service....
So do not buy just one, buy two and buy two again when the last one is installed. Who doesn't want to get a few more years out of your hot water system.
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I have a tankless hot water heating system. Problem was that the unit would quit working, apparently due to a mineral buildup, right after the warranty period elapsed. After replacing several heating units I finally found the Aqua Pure. I put one of the Aqua Pure systems in place several year ago, replacing the canister once or twice a year and have not had another problem with my hot water heating since. This product absolutely works. Replacing the canister only takes a few seconds and is very much cheaper as well as easier to replace than the hot water heater itself.
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