Waterdrop AP431 Replacement Cartridge for Aqua-Pure AP431 Hot Water Scale Inhibitor for AP430SS, Prevent Scale Accumulation and Protect Water Heaters, Pack of 3

These scale inhibitors work great with my well water. They prevent a build up of scale which damages plumbing and fixtures. I have been using this for several years and my fixtures work and look like new. Even the shower heads and aerators stay clean. Great product. I would recommend these if you have minerals in your water.

Seems to be working pretty well

no issues so far. i use these for my boiler/hot water. no leaks and change every 6 months

The threading is a bit different on the Waterdrop, but I was able to install it without any leaks. It is meant to prevent lime deposits in the water in a heating system. Contains some type of food grade polyphosphates. I have it only on my heating system part of the plumbing, to protect the heat exchanger and tankless water heater. I expect to replace it less often than a whole house installation, e.g. once per year.

This cartridge fit great and appears to work good. The water has the same clarity and taste as with any other brand of cartridge I've used so I would say it works.

Easy to install and has prolonged the life of my water heater

I have started purchasing and using these replacement cartridges for all of my Aqua-Pure descale installations. I am a plumbing contractor, so I perform annual maintenance service to all my customers that have tankless water heaters. This includes replacing the cartridge when I do the descale operation using a recirculating pump and vinegar solution (many videos on youtube on how to do this).I Install the stainless steel tee, which is supplied with the complete scale inhibitor kit (available on Amazon), on a horizontal section of the cold water pipe downstream of the shut-off, before the flexible corrugated connector on the inlet to the tankless water heater. I also use 3/4" brass or stainles steel nipples (not galvanized steel!) on either side of the tee, but typically on the outlet for the female union of the flexible connector.These cartridges have proven as reliable as the Aqua-pure that I normally use, at a reduced cost.These are NOT filters, as many people assume. They are in-line water treatment system which uses polyphosphates to inhibit hard-water scale buildup. I have used this system for many years to protect the internal heat exchange chamber on all of the tankless water heaters that I install for my customers.You could also install these on the cold water line coming into your house as a whole-house water treatment, but you would probably want to replace them more often due to increased use.I hope this info has been helpful - cheers!

These are for my tankless hot water heater. Change them every 6 months. They keep water clean as I’m am allergic to the water where I live in Florida. i’m saying that they are great & I love them. Keeps my skin from red hot rashes.