Patriot Pro SXTi, Руководство по обслуживанию

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Hard water affects your house plumbing
Perhaps the greatest damage done by hard water is the damage that you can't easily see. Water heaters, humidifiers,
boilers and household pipes become lined with an increasingly thick layer of calcium and magnesium scale.
As this scale builds up, the water flow in your pipes diminishes to such a point that new piping is usually the only
realistic option to remedy the situation.
Hard water scale inside a water heater forms an insulating layer that prevents the burners or heating elements from
heating the water efficiently. Just 1/8" of scale inside the tank can require up to 30% more fuel to heat the water to
the desired temperature.
How water hardness is measured
Water hardness is measured in imperial Grains per Gallon (gpg). A grain, in this case, is the weight of an average
dry grain of wheat, approximately 1/7000th of a pound. The water treatment industry generally uses the following
standards to classify water hardness.
Soft Water 0 - 0.5 gpg
Slightly Hard Water .5 - 3.5 gpg
Moderately Hard Water 3.5 - 7 gpg
Very Hard Water 7 - 10.5 gpg
Extremely Hard Water 10.5 gpg and greater