What Is Limescale?

When water comes from areas high in calcium or magnesium carbonate, hard water leaves mineral deposits commonly known as “limescale” or “scale”.

Image of scale
Image of scale

Limescale build-up can block pipes faucet aerators and cause corrosion. In addition, it’s unsightly, leaves deposits on clothes and dishes, and is a constant nuisance for homeowners. More significantly, limescale build-up on water heater elements reduces their overall efficiency and drives up energy bills.


Why Is Limescale Bad?

  • Restricts Flow
  • Slows Transfer of Heat
  • Decreases Effciency
  • Damages Heating Elements
  • Decreases Water Pressure
  • Shortens Life Span
  • Requires Frequent and Costly Maintenance

Where Is Limescale Found?


Your best defense against limescale

ScaleRx protects your home appliances from limescale build-up and keeps them running efficiently. It requires no power supply, batteries, chemicals, or filters. It is simple to install and maintenance-free.

ScaleRx uses a patented Turbulent Galvanic Polarization (TGP) system to disrupt the formation of limescale crystals. ScaleRx has been shown in tests conducted by IAPMO R&T to be 76% effective at preventing limescale deposits. In side-by-side comparison testing it was four times more effective than the leading electronic scale reduction device.

How Does ScaleRX Work?

ScaleRx contains alloy discs that create a small galvanic current, which prevents the formation of calcite crystals (limescale).  Calcium Carbonate instead forms Aragonite crystals, allowing the mineral content to flow freely through without accumulating on surfaces.   Nothing is filtered, removed or chemically altered.


Proven Performance


I did my homework before getting this descaler. I am on a well and have hard water. The softener never really ever removed all the hardness. This unit is the next generation up

Customer · Reviewed on

It really works! Scale is changed into white powder and is washed away

Customer - Reviewed on

I hooked up ScaleRx when I installed a tankless water heater a year ago. Good price for 12 years warranty! I installed a couple more ScaleRx for my friends’ houses tank & tankless water heaters. I definitely recommend ScaleRx

Customer - Reviewed on

With over 12 years of experience as a master plumber in the ever-changing and advancing plumbing industry, I have seen more than my fair share of water treatment fads come and go. I can honestly say, ScaleRx is here to stay. ScaleRx has helped me better serve my customers and has set me apart from the competition. It is the best bang for your buck – I have yet to find any other product that can even come close to competing with it. American Valve has really pulled off something extraordinary here.

Master Plumber – reviewed on Instagram

Frequently Asked Questions

Where can ScaleRx be used?

ScaleRX can be used on any residential water heater. ScaleRx Home can be used on the main water line to your home. ScaleRx replaces just under 12 in. of pipe, so you will want to leave enough space to work around any pipe fittings or obstacles.

How long does ScaleRx last?

ScaleRx contains no filters and is maintenance-free. The body is made of 304 stainless steel, and testing has shown that ScaleRx remains effective after 12 years of constant use.

Can I install ScaleRx outside?

Certainly! The outside components are made of durable stainless steel and made to survive harsh environments. ScaleRx Home comes with optional SharkBite™ fittings which are not rated for outdoor use.

What type of pipe do I need to use?

ScaleRx is compatible with hard copper (types L, K and M), PEX, HDPE, PE-RT, CPVC, or and PVC pipe. Brass or plastic adapters may be used to connect.

Why doesn’t ScaleRx need an external power source?

ScaleRx contains patented TGP® turbines that create both turbulence and a small galvanic current. These features combine to prevent the formation of calcite crystals.

How much flow restriction is there?

Less than 1 GPM pressure drop. ScaleRx doesn’t reduce household water pressure.