Dark Water Softening Resin

Lanlang ® TC012FG Black color high cross linkage gel type strong acid cation exchange resin Used for water softening and demineralization
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Whether a water supply is labelled "soft" or "hard" is dependent on the presence of two highly soluble minerals, calcium and magnesium. From a health standpoint, these minerals have no adverse effects and are, in fact, essential daily nutrients. It is minerals that give water the refreshing flavor many people find desirable. However, when calcium and magnesium permeate water, they buildup on contact surfaces, possibly plug pipes and damage water heaters, and decrease the effectiveness of soaps and detergents. At this point the water is said to be hard.

Water hardness is expressed in one of two units of measurement. The first unit is parts per million (ppm) of calcium carbonate, a term equivalent to the concentration of dissolved calcium and magnesium. Using this equivalent simplifies hardness calculations. One ppm means that one unit of calcium carbonate is dissolved in one million units of water. Parts per million is also equal to milligrams/liter (mg/l). A second expression of hardness is grains per gallon (gpg) of calcium carbonate. A gpg is used exclusively as a hardness unit and equals approximately 17 mg/l or ppm.

If you have your water tested, the report will use one or both of these units to tell you how hard your water is. Since the level of calcium carbonate means little to water consumers, water specialists have classified levels of hardness.

ssificationGrains per gallon
Parts per million or
milligrams per
liter (ppm) or mg/l)
SoftLess than 1.0Less than 17
Slightly hard1.0 to 3.517 to 60
Moderately hard3.5 to 7.060 to 120
Hard7.0 to 10.5120 to 180
Very hardGreater than 10.5Greater than 180

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dark water softening resin

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