Water that is difficult to make soap suds in because it contains calcium and magnesium salts.

Drinking water term that indicates water that contains one grain per gallon (17.1 ppm or mg/L) or higher of total hardness. The ideal range of hardness for pools and spas is 200 to 400 ppm.

water containing relatively high concentrations of calcium ( Ca2+), magnesium ( Mg2+), or iron(III) ( Fe3+) ions that form precipitates with soap.

such water than contains dissolved salts of calcium and magnesium in a concentration greater than 200 ppm.

When rainwater passes through rocks such as chalk and limestone, a certain quantity of mineral salts such as Calcium and Magnesium Carbonate dissolve into it. These hardness's salts are then carried into the mains water supply. Most commonly these are expressed as p.p.m. of Calcium Carbonate. Anything in excess of 250 p.p.m. is considered hard. If you live in the South of England on Chalk or in the Pennines on Limestone then your water will be very hard, in excess of 500 p.p.m. If you have hard water you will have noted "furring" of kettle elements and may have fitted a water softener to avoid problems with boilers and dishwashers. In pool and spa water, some hardness is desirable as it prevents corrosion of pool surfaces and stops tiling grout dissolving into the water. If on the other hand it is too hard, then scaling will result. This is unsightly at best and can cause damage to boilers at worst.

Water containing soluble salts of calcium and magnesium, and sometimes iron.

Water with a high concentration of the Ca2+, Mg2+, and/or Fe3+ ions.

A water condition which has a lot of dissolved salts.

Water containing excessive amounts of calcium and magnesium ions which prevents soap from lathering and produces scale and incrustation.

Water that contains relatively large amounts of calcium and/or certain other minerals that cause soap to precipitate. (Gontrast soft water.)

the term used to describe water that is high in calcium or magnesium. High levels, usually over 400 PPM, can lead to clarity and scaling problems, if not treated. Source of the calcium can be natural or can be contributed by chemicals such as calcium hypochlorite.

Water which has a high concentration of dissolved minerals and solids.

water that contains salts (as calcium and magnesium ions) that limit the formation of lather with soap

Water that contains salts that prevent the formation of lather with soap. Hard water can affect your plumbing by leaving scaley deposits in the pipes. The pipes may narrow or clog with time.

"Hard" water is water with a lot of dissolved minerals in it, typically calcium and magnesium. Because water is an excellent solvent, it dissolves small amounts of minerals as it percolates through rocks and soil. As the mineral content increases, so does the "hardness" of the water. Hard water will tend to leave behind mineral deposits, which require frequent cleaning or replacement of pipes, filters, and jewels.

water containing a high level of calcium, magnesium, and other minerals. Hard water reduces the cleansing power of soap and produces scale in hot water lines and appliances.

Water that contains calcium and magnesium ions. This type of water will not form a stable lather with soap.

Alkaline water containing dissolved salts that interfere with some industrial processes and prevent soap from lathering.

Water with a total hardness of one grain per gallon or more, as calcium carbonate equivalent.

Hard water is water which will not readily form lather with soap due to the presence of dissolved calcium or magnesium salts in the water.

Water containing more than 20mg/l of calcium carbonate.

Water containing high concentrations of alkaline earths, such as calcium and magnesium, derived from the drainage of calcareous deposits. Most of the lakes in Alberta are hardwater lakes. See also soft water.

Condition of water due to the build up of dissolved salts, usually calcium and magnesium; pH balance is above 7. see also Alkaline

Water with a high level of minerals including calcium, iron, magnesium, copper, etc.

This is water that finds it difficult to form lather with soap. Back to top of the page

Water which contains calcium and magnesium salts that have dissolved from the rocks over which the water has flowed. Water that does not contain these salts is called soft water. There are two types of hardness -- temporary hardness, which can be removed relatively easy and permanent hardness, which is more difficult to remove.

That water which is high in calcium hardness and other salts which, as such, resists soap being lathered.

Water that has picked up minerals such as calcium and magnesium as it travels through certain types of rock and soil. Approximately 85 percent of the country has hard water. hardness is measured in both parts per million (ppm) and grains per gallon (gpg). Anything more than one gpg or 17.1 ppm qualifies water as "slightly hard." It is the minerals in water that can eventually form scale deposits in water-using equipment.

Water containing Fe3+, Ca2+, and Mg2+ ions, which forms precipates with soap.

Water with more calcium and magnesium salts than is normal.

A water high in calcium and magnesium.

Water that contains certain minerals, usually calcium and magnesium sulfates, chlorides, or carbonates in solution in sufficient amounts to cause a curd or precipitate instead of a lather when soap is added. Generally defined as water containing 332 ppm of calcium carbonate. Very hard water may cause precipitates in some herbicidal sprays.

Natural water containing impurities in various proportions. Traditional hardness is a measure of calcium or dissolved solids in a solution, measured in parts per million. Hard water generally ranges from 100 to 250 ppm

Water that is high in calcium, magnesium or other salts, which makes it difficult for soap to lather. Hard water also has a tendency to form scale.

Water having a high concentration of calcium and magnesium ions. Water is considered hard if it has a mineral content of minerals such as calcium carbonate greater than 100 mg/L.

Water rich in magnesium and calcium salts, which causes soap to form curds. Hard water is water that contains dissolved chalk, lime and other minerals. Rainwater is naturally soft, but as it percolates through chalk and limestone, it dissolves and collects these minerals. The "hardness" of the water to your home is dependant on where you live and the source (river or ground water) of your main water supply.

water that contains dissolved calcium and magnesium

Water which contains ions of magnesium (Mg) and calcium (Ca).

Water containing total hardness in the amount of one grain per U.S. gallon (or more) measured as calcium carbonate equivalent.

Definition: Water that contains a great number of positive ions. The hardness is determined by the number of calcium and magnesium atoms present. Soap usually dissolves badly in hard water. The hardness in water is caused by certain salts. The main hardness causing ions are Calcium (Ca2+), Magnesium (Mg2+) and Bicarbonate (HCO3-). These ions or minerals are normally addressed as scale in the water causing scaling of pipes and equipment in drinking water and process water systems. Softening units offer a water purification solution for hard water and lime scale removal.

water with high alkalinity, usually due to calcium bicarbonate content. This will give the water a high pH. Hard water feeds are for water with high alkalinity, with a pH of at least 7.6 or above.

Water which contains calcium or magnesium in an amount which requires an excessive amount of soap to form a lather.

Groundwater that contains dissolved calcium and magnesium, usually after passing through limestone or dolomite.

Water with an excessive mineral content.

water from natural sources that contains relatively large concentrations of calcium and magnesium ions.

Hard water that contains a large amount of minerals.

Hard water is water that has a high mineral content (water with a low mineral content is known as soft water). This content usually consists of high levels of metal ions, mainly calcium (Ca) and magnesium (Mg) in the form of carbonates, but may include several other metals as well as bicarbonates and sulfates. It is not generally dangerous.