3M Aqua-Pure AP431 Whole House Scale Inhibition Inline Replacement Water Cartridge For System AP430SS, Genuine 3M Replacement Cartridge

We have several different 3M Aquapure products in our home and this AP431 whole house scale reducer is one of them. Initially you need to buy the kit as it comes with the special "T" fitting. Afterwards you can just buy the cartridges itself periodically. Side note, it's not a bad idea to stock up on these as the prices have gone up significantly since we started buying these about right (8) or so years ago. We got it primarily to protect our appliances such as our tankless water heater, shower heads, kitchen faucet and washer. So far we have zero issues to date! What also might be helping is our whole house water filtration system which takes care of sediment, rust, etc. at the source. Please see my attached photos of the cartridge as well as installed photo. **Last pro-tip** - since the cartridge threads are plastic, it's very easy to cross-thread the cartridge and chew up the threads. An old trick I learned for any screw fitting is to reverse it in first (left-loosey) until you feel the first thread "seat". This trick always ensures you engage the female threads for a perfect, trouble-free install!

Easy to install and since we have city water, we replace once a year when we have the boiler serviced. The company we choose uses the same part and charges quadruple the costs to replace it. It's a no brainer to purchase it ourselves and have the tech install it.

A contractor installed a Rheem tankless hot water heater in my house. I love it. When I called a plumber to service/flush it out 3 years after the initial installation, he advised me to get this filter which I did & he installed. Now it seems I can go every 5-6 years between service/flushings. And we have pretty good water in my area of NorCal.

I have used this 4 months now, and replaced the cartridge after 3 months. Cartridge changeout is very easy as long as shutoff valves are closed at both the inflow and outflow sides. My reason for installing this was to prevent scale buildup in my new tankless hot water heater which would shorten the lifespan of the expensive heater. Since it is installed as a whole-house unit, this cartridge system should also help prevent scale buildup in the showerhead, and in our coffee maker. So far it appears to be doing a good job, and to ensure it is always functioning optimally I will change the cartridge every 3 months.

Works great and easy to replace it in the metal tee.

This product is a total game changer for anyone with a well! It has saved our showerheads, faucets, and my tankless hot water heater! If you have a well, you need this filter, it’s worth every penny!

We had this unit installed by a plumber as a part of a tankless water heater install. I failed to flush the heater at the one year mark due to health issues but did at 2 years. We have very hard water and my expectations were for a significant scale to show up during the flush but actually had very little. We use this downstream from our water softener unit due to our water hardness. I did note that the new cartridge was EXTREMELY difficult to NOT cross thread during installation. Take your time and be very careful. A method I use for this type of situation is to place the threaded piece into the socket and gently rotate it counter clockwise until I can feel the the first thread "click" slightly as it passes the first thread then start threading into the socket in a clockwise manner. Carefully observe that the cartridge is going in straight and threading in EASILY. The easy threading is critical. The threads on the plastic cartridge don't form the seal, the o-ring does. If the threads bind at all you are likely starting to cross thread. If that happens back out and try again. It took me 3 tries to get the cartridge to thread easily because the way we have ours mounted its at about waist level to me. By getting a lower view and being level with the socket I was able to easily tell when the threaded portion was not going in straight.

I have been using these for a couple of years now. I added this inline before my tankless water heater, to protect it from scale. I have definitely noticed that since adding the filter it has eliminated hard water build-up on my faucets and shower heads. I set an alarm on my phone to change it every six months, and have one auto delivered from Amazon "Subscribe & Save".

Great product. Works great

Fácil de instalar, no he podido comprobar que tan bien funciona, pero mi calentador de paso funciona a la perfección y lo pienso seguir usando. Siento que las malas opiniones del producto son en lugares en donde el agua es muy dura. En Monterrey, México funciona bien. Lo único que me extraña son las variaciones tan grandes en el precio del producto. El primero me costo como 4 veces mas que estos últimos. Espero que no sea por fecha de caducidad.

Me reduce estar limpiando mi monomando, no quita por completo pero alarga el tiempo en que se tapan o hay que desarmar y limpiar, dependiendo de la dureza del agua debes cambiarlo antes de los 6 meses

This actually works great at reducing scale buildup. Use it on my RV water inlet

Tengo un calentador de agua instantáneo y esto funciona muy bien para proteger mi unidad. Lo cambio cada 6 meses para obtener los mejores resultados.