Water may look simple, but its chemistry can have a major impact on the plumbing components it comes into contact with.
Hard water, soft water, chlorine, chlorides, temperature, and pH can all influence how fittings and valves perform over time. Understanding these conditions can help you select the appropriate material for the application.
Hard water contains dissolved minerals, particularly calcium and magnesium.
While these minerals don't necessarily cause immediate problems, they can eventually create scaling and corrosion concerns.
In brass valves, calcium and magnesium can precipitate out of the water and form a chalky layer of mineral scale inside the valve. Over time, this buildup can reduce water flow and interfere with moving components.
Mineral buildup can cause several mechanical problems:
Reduced water flow: Scale can build up inside the valve and reduce the available flow area.
Seized mechanisms: In brass gate and ball valves, mineral deposits can accumulate around the ball, gate, or stem and prevent the valve from operating properly.
Hard water can also contribute to a more noticeable green patina on brass components, sometimes mixed with white, chalky lime scale.
Soft water contains fewer dissolved minerals, but that doesn't necessarily mean it is less aggressive toward plumbing materials.
Naturally soft water can have low mineral content, low buffering capacity, and a
However, it's important to distinguish naturally soft water from water softened through a typical salt-based ion-exchange system.
A properly maintained ion-exchange water softener replaces calcium and magnesium with sodium which does not inherently accelerate dezincification.
For applications where chlorine exposure is a concern, stainless steel can provide a more suitable option than yellow brass. The choice between 304 and 316 stainless steel depends on the chlorine and chloride levels present in the water.
When using 304 stainless steel we recommend installing an activated carbon cartridge to
The right choice depends on more than simply whether the water is hard or soft. Chloride levels, chlorine, pH, temperature, mineral content, and flow conditions can all affect how a fitting or valve performs over time.
Before selecting a material, consider the environment the component will be exposed to.
Understanding your water chemistry can help you make a more informed decision between brass, bronze, 304 stainless steel, and 316 stainless steel—and ultimately select a product that is better suited to the application.
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