A chemical substance is any material with a definite chemical composition, no matter where it comes from. Hill, J. W.; Petrucci, R. H.; McCreary, T. W.; Perry, S. S. General Chemistry, 4th ed., p5, Pearson Prentice Hall, Upper Saddle River, New Jersey, 2005. For example, a sample of water has the same properties and the same ratio of hydrogen and oxygen whether the sample is isolated from a river or made in a laboratory. A pure substance cannot be separated into other substances by any mechanical process,Ebbing, D. D.; Gammon, S. D. General Chemistry, 7th ed., p12, Houghton Mifflin, Boston, Massachusetts, 2002.. Typical chemical substances found in the home are water, salt (sodium chloride) and sugar (sucrose). Generally, substances exist as solid, liquid, or gas, and may change between these phases of matter with changes in temperature or pressure.
The concept of chemical substances was established in the eighteenth century by the chemist Joseph Proust. He did careful studies of the composition of some pure chemical compounds such as basic copper carbonate Hill, J. W.; Petrucci, R. H.; McCreary, T. W.; Perry, S. S. General Chemistry, 4th ed., p37, Pearson Prentice Hall, Upper Saddle River, New Jersey, 2005. He deduced that: "All samples of a compound have the same composition; that is, all samples have the same proportions, by mass, of the elements present in the compound". This became known as the law of constant composition, and it is one of the foundations of modern chemistry.
Water Treatment :: Kitchen and Dining

Supply Inc. - Manufacturer of a complete line of pool and spa chemicals.
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Alden Leeds - Provides several full lines of swimming pool chemicals to the professionals in the pool business.
Algae Bar - An alternative to chlorine for swimming pools, koi ponds, hot tubs, spas, water gardens, and fountains.
Meta Description: [ An Algae Bar is a low cost alternative to using chlorine to prevent algae in your swimming pool, koi pond, hot tub, or spa. ]
BioGuard - A manufacturer of pool and spa chemicals. Site includes problem water troubleshooting and pool triva monthly contest
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Confederate Chemicals - UK supplier of spa chemicals.
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Coral Seas - This site features information on Yellow Out, a ecologically-safe algae cleaner. Detailed information is also included at this site.
Crystal Clear Pool and Spa - Manufacturer and exporter of ECLIPSE3 swimming pool treatment.
Earth Science Laboratories Inc. - This site offers information on Non-Chlorine pool and spa care. Site includes interactive water testing and listing of dealers in your area.
fey Technical Services - UK supplier of commercial pool chemical dosing equipment.
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Focus Pools - Spa, pool, and hot tub chemicals.
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Jack's Magic Products Inc. - Manufactures a complete line of swimming pool stain removal and problem-solving chemicals.
JAJA Group, Inc. - This site provides a wealth of information including various uses for the company's calcium hypochlorite and other water treatment chemicals.
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Laporte Water Technologies - Laporte Water Technologies manufacturers quality swimming pool spa products and accessories. Look for Leisure Time, GLB, Robarb, Blue Devil, and Applied Biochemists for pool spa water treatment.
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Lawrason's Pool Products Inc. - Canadian manufacturer of Aqua brand swimming pool and Spa Life brand spa chemicals.
Nature2 - Provides alternative sanitation techniques for pools and spas using silver ions and low chlorine levels.
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Orenda Technologies, Inc. - Manufacturer of Clearview brand chemicals, including enzymes.
Pacific Sands - Eco-One spa care products. A simple, safe and inexpensive alternative to chlorine and bromine.
Perfect Pool and Spa - Pool and spa care software to monitor and adjust water chemistry.
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PoolSoft - Water analysis software for swimming pools and spas.
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sanitize the water. Ph, Alkalinity, Chlorine, etc. ]
Stain Eraser - Manufacture of the Stain Eraser.
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