Search  for anything...

3M Aqua-Pure Whole House Scale Inhibition Inline Water System AP430SS, Prevents Scale Build Up On Hot Water Heaters and Boilers

  • Based on 5,002 reviews
Condition: New
Checking for the best price...
$103.24 Why this price?
Save $246.75 was $349.99

Buy Now, Pay Later


As low as $17.21 / mo
  • – 6-month term
  • – No impact on credit to apply
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout.

Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Apple Pay, and PayTomorrow. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Selected Option

Free shipping on this product

FREE 30-day refund/replacement

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.


Availability: In Stock.
Fulfilled by Amazon

Arrives Sunday, Jul 12
Order within 20 hours and 4 minutes
Available payment plans shown during checkout

Protection Plan Protect Your Purchase
Checking for protection plans...

Size: 1 Count (Pack of 1)


Style: AP430 System


Features

  • Helps Inhibit Scale: Polyphosphates included in This Product bind calcium and magnesium hardness minerals, preventing them from becoming a solid to help reduce the build-up of mineral scale in pipes and water using appliances
  • Helps Protect Hot Water Heaters: Extend the life of water-using appliances such as water heaters, clothes washers and dishwashing machines, as well as plumbing fixtures like faucets, pipes and shower heads by reducing scale build-up and corrosion
  • Not a Filter, A Scale Reduction System: System diverts only a small portion of water passing through the system head into the cartridge to inject polyphosphates in minute concentrations and return it to the water supply to help reduce scale build-up
  • Minute concentrations of polyphosphates help reduce scale build-up by inhibiting the build-up of hardness minerals onto metallic surfaces. Polyphosphates also help reduce corrosion by forming a thin protective layer on the inner-surface of pipes
  • Maintains Efficiency: By Inhibiting Scale Build Up On Heating Elements, Helps Maintain Water Heater Efficiency
  • Easy To Replace: Easy Change Out Of The 3M Aqua-Pure Ap431 Replacement Water Cartridge Makes System Maintenance Easier
  • High Flow Rates: The AP430SS provides unrestricted flow of up to 10 gpm (37.9 lpm) when installed with 3/4 NPT inlet/outlet connections
  • System is to be installed on cold water line feeding water to the water heater. Included System Head fittings are two 3/4" NPT (female) connections. Additional parts and tools are required for installation and not included
  • For parts and tools required, read all instructions carefully and measure your cold water line feed pipe before attempting to start installation

Description

The 3M Aqua-Pure Whole House Scale Inhibition Inline Water System Ap430Ss Is Designed To Help Reduce Scale Build-Up And Corrosion - Thereby Helping To Extend The Life On Hot Water-Using Appliances Such As Water Heaters (Standard (Gas Or Electric) And Tank-Less), Boilers, Clothes Washers And Dishwashing Machines, And On Plumbing Fixtures Like Faucets, Pipes, And Shower Heads. The Ap430Ss Provides Flow Of Up To 10 Gpm With ¾” Npt Inlet/Outlet Connections. Scale Is Calcium And Magnesium Deposits That Often Form When Hard Water Is Heated. Water Hardness Is Responsible For Most Scale Formation In Pipes, Water Heaters, Finishes And Flat Surfaces, And Other Water Using Appliances. Over Time Scale Build-Up Can Significantly Shorten The Life Of Any Water-Using Appliance. Also Scale Buildup Inside Pipes Causes Loss Of Water Pressure As The Interior Gets Smaller And Smaller Over Time. The Ap430Ss Contains Polyphosphates To Bind Calcium And Magnesium Hardness Minerals, Helping To Prevent Them From Precipitating Out (Or Becoming A Solid) And Building Up On Metallic Surfaces. Polyphosphates Also Helps Prevent Corrosion By Forming A Thin Protective Layer On The Metal Surface. The 3M Scale Inhibition Water System Ap430Ss Is Tested By Nsf International To Nsf/Ansi Std. 42 For Material And Structural Requirements Only. The Overall Single Vessel/Cartridge Design Of The Ap430Ss Makes The 3M Aqua-Pure Ap431 Water Filter Cartridge Change-Out Easy For Professionals As Well As End Users. Change Disposable Filter Cartridge Every 6 Months Or Sooner If You Observe Noticeable Reduction In Water Flow Rate. The Ap430Ss Is To Be Installed On The Cold Water Supply Line Of The Water Heater Or At Point-Of-Entry Of Water Into The Home. Tools And Parts Required (Not Included): One ¾” Stop And Waste Valve (Compression Type), Ptfe Tape, Two ¾” Male X ¾” Street Adapters, One ¾” Compression Gate Valve, And Pipe Cutter. Read All Instructions Carefully Before Attempting To Start Installation. The Existing Shut-Off Valve Remains In Place And Still Acts As The Cold Water Shut-Off. This Filter System Has 3/4” Connections. The Ap430Ss Can Be Adapted To Various Pipe Sizes By Using Reducing Adapter On Either End. Installation Fittings Can Be Sweated Or Threaded. Use Galvanized Fittings For Installation On Galvanized Pipe.

Material: Polypropylene (PP), Stainless Steel


Product Dimensions: 2.8"D x 2.8"W x 10.2"H


Item Weight: 0.86 Kilograms


External Testing Certification: NSF


Product Benefits: Extends Life of Appliances, Inhibits Lime-Scale Growth


Model Number: 70020003060


Product Benefits: Extends Life of Appliances, Inhibits Lime-Scale Growth


Brand Name: Aqua-Pure


Set Name: AP430SS


Global Trade Identification Number: 74


Manufacturer Warranty Description: Warranty


Unit Count: 1 Count


Number of Items: 1


Manufacturer Part Number: AP430SS


Item Type Name: Scale Inhibition System


Manufacturer: 3M


Included Components: Head and Cartridge, User's Manual


Material Type: Polypropylene (PP), Stainless Steel


Compatible Water Purifier Models: 3M AP430SS


Item Dimensions D x W x H: 2.8"D x 2.8"W x 10.2"H


Item Weight: 0.86 Kilograms


External Testing Certification: NSF


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Sunday, Jul 12

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Top Amazon Reviews


  • Easy install
Size: 1 Count (Pack of 1) Style: AP430 System
Excelente and easy to install
Reviewed in the United States on December 29, 2025 by Amazon Customer

  • Polyphosphate Power! ... Evil Calcium Trembles!
Size: 1 Count (Pack of 1) Style: AP430 System
Works with magic and unicorn tears. :o) It is not a filter. It is a water treatment system. The stainless steel head is robust and a nice solid chunk of metal. Easily could withstand brazing/soldering, on the spot, with the cartridge off. The 3/4" NPT inlet and outlet has nearly a clear flow path, so your GPM, will not be reduced. Install a ball or gate valve in front to permit easy cartridge changeouts. The tee must be orientated to the water flow, use the arrow on the side of the tee, for the water to get treated while flowing. There is an elevated tab in the tee with a single hole for directing a small portion of the water down into the center whole of the cartridge. The water slowly dissolves a small amount of food-grade polyphosphate from the beads and, using the venturi effect, the water is then pulled back through the 8 holes in the cartridge perimeter and through the 3 holes in the tee, surrounding the center tab, to mix with the flowing water. Only 2 to 3 ppm is needed to treat for scale. From past uses at a different home, I've gotten about 20,000 gallons out of a cartridge with still some beads rattling in the bottom when replacing the cartridge. I would say that if you used less than 2,000 gallons a month then one cartridge should easily last a year. The cartridge threads are plastic and you can easily cross-thread them if you get in a hurry replacing the cartridge. Just make sure you get the threads started straight and it screws up with no problems. The threads do no provide the seal, it is the o-ring so once hand-tight that is tight enough. ... show more
Reviewed in the United States on May 9, 2018 by James M. Harman

  • A good, but expensive solution to deterring scale buildup.
Size: 1 Count (Pack of 1) Style: AP430 System
After installing a tankless water heater, I decided to order the 3M Aqua-Pure water treatment apparatus in hopes of preventing scale buildup within the water heater. So far, this appears to be working well, and I haven't noticed any reduction in the water heater's efficiency. The main drawback of this system is the cost of replacement cartridges, which should be changed out every 3 months. Recently, 3M increased their pricing by nearly 50 percent. Fortunately, other manufacturers are making replacement cartridges that are far less expensive, will work with this apparatus, and are available at Amazon. ... show more
Reviewed in the United States on February 22, 2025 by Rick Rickoff

  • Tick tock time will tell
Size: 1 Count (Pack of 1) Style: AP430 System
2 weeks in so far so good
Reviewed in the United States on April 20, 2026 by Abel H.

  • Simple solution without sodium
Size: 1 Count (Pack of 1) Style: AP430 System
This turned out to be a simple, effective solution to two problems associated with my well water. At 12.86 gpg of CaCo3 (Calcium Carbonate) or 2.36 gpg above the "Very Hard" threshold, I had problems with calcium deposits in my boiler from the boiler feed water inflow and problems from my hot water throughout the house. Since all the water going to my dishwasher came from a hot water line, water spots on glassware were unsightly. I installed the Aqua-Pure AP430SS just before both the boiler feed and the supply to the indirect hot water tank. The water spots are gone and there are more soap bubbles when showering. A note to those who think the shiny silver thing on the top assembly is an overpriced ¾" SS tee. . . it's more than that. It is a machined casting with a scoop diverter to cause some of the water flowing through it to flow downward into the canister where it mixes with the food-grade poly phosphate in the replaceable canister before it returns through small holes drilled inside the tee to the pipe above where it ties up the CaCo3 as it flows on its merry way unable to plate our as scale. Time will tell, but, I prefer it over a water softener because it is sodium free which seems like a good thing in this stressful world of high blood pressure. Also, it won't kill the beneficial bugs in my septic system. Whew – enough said! ... show more
Reviewed in the United States on October 22, 2015 by J. Hudon

  • Works great but needs to be flushed after initial install and filter changes.
Size: 1 Count (Pack of 1) Style: AP430 System
Be sure to flush the filter with something that doesn’t have a fine filters for 5-10 mins or so after installation. I have those electric smart toilets and it filled the bowls with little pieces black plastic and clogged their inline filters. Game changer in water quality. My showers and appliances are as grateful as I am. ZERO spots on the shower doors or sinks. ... show more
Reviewed in the United States on August 30, 2025 by Jamie

  • So far, so good....
Size: 1 Count (Pack of 1) Style: AP430 System
I hardly ever post reviews, but I must review this item. I purchased this in lieu of a water softener. I have very hard water and really didn't want to deal with salt delivery, so I gave this a shot out of desperation...with low expectations. Over the years, I've tried gimmicks on the market with 0.00% results (electrical coil thing comes to mind). After two months of use, I can say that this in fact does seem to prevent about 75% of hard scale build-up. Instead of hard to remove scale and large sediment chunks in my faucet aerators, I'm seeing more of a white dust. In removal of all my aerators for inspection, I'm seeing about 75% less hard clogging scale. My dish-washer also appears to have a white dust coating inside as opposed to hard scale all over the place. My wife says that the glassware is coming out of the washer much cleaner also. So far, so good. Not sure how long this "filter" will last, but I'm fine with the cost of replacement every couple of months if that's what it takes. Might last longer, not sure yet. Btw...I installed this filter right before water enters my tank-less water heater. Installation is simple...use Sharkbite PTC fittings, tubing and make sure to add a SharkBite ball valve before and after the filter. Pretty simple installation. ... show more
Reviewed in the United States on January 26, 2018 by Jim Van Halen

Can't find a product?

Find it on Amazon first, then paste the link below.
Checking for best price...