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Phosphorus Chloride and Your Pool

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Phosphorus chloride is a colorless fuming liquid that hydrolyses in moist air to release phosphoric acid and hydrogen chloride. It is manufactured industrially on a large scale from white phosphorus by reacting it with chlorine gas. It is a key building block of many compounds with diverse applications in organic synthesis, gasoline production, textile finishing, micro and nanoelectronics and the manufacture of plasticizers, herbicides, and flame retardants. It is also used as an intermediate in the Wittig reaction and Horner-Wadsworth-Emmons reactions, although these reactions are more often performed with phosphine. It is the precursor to triphenylphosphine, a key intermediate in the Wittig reaction, and to a range of phosphite esters, such as trioctylphosphine oxide (TOPO). It is also a major starting point for aryl phosphates, including the herbicide glyphosate.

Phosphates in your pool come from garden fertilizer runoff, rotting leaves and certain types of pool chemicals, and your city water supply. At high levels, phosphates feed algae growth that can turn your pool water green and cloudy. Maintaining low phosphate levels in your pool makes it easier to keep proper pool chemistry and prevents excessive algae growth.

It is important to note that phosphate removers should be used sparingly, if at all. They can cause a variety of problems, such as metal corrosion and chemical imbalances. In addition, they can be expensive to use, and are only effective when the phosphate level is very high. Ultimately, there are several things you can do to reduce your phosphate level and prevent algae growth, such as maintaining low sanitizer levels and keeping organic materials out of the pool.