Polyquat
Encyclopedia
Polyquat is the common name for a class of swimming pool and hot tub
Hot tub
A hot tub is a large tub or small pool full of heated water and used for soaking, relaxation, massage, or hydrotherapy. In most cases, they have jets for massage purposes. Hot tubs are usually located outdoors, and are often sheltered for protection from the elements, as well as for privacy....

 algaecide
Algaecide
An algaecide or algicide is a substance used for killing and preventing the growth of algae.-Natural algicides:Barley straw, in England, is placed in mesh bags and floated in fish ponds or water gardens to help reduce algal growth without harming pond plants and animals...

 which is chemically mostly n-alkyl-dimethyl benzyl ammonium chloride (some dialkyl monomethyl isomers are also included), which is also known as benzalkonium chloride
Benzalkonium chloride
Benzalkonium chloride, also known as alkyldimethylbenzylammonium chloride and ADBAC, is a mixture of alkylbenzyldimethylammonium chlorides of various even-numbered alkyl chain lengths. This product is a nitrogenous cationic surface-acting agent belonging to the quaternary ammonium group...

. The alkyl groups are usually C14 and C16. The common name derives from the fact that these compounds are POLY-alkyl QUATernary amines.
R-N+(CH3)2-CH2-C6H5 Cl-

R = -C14H29 or -C16H33

Pre-diluted solutions of polyquat of 5% or less are sold for the hot tub
Hot tub
A hot tub is a large tub or small pool full of heated water and used for soaking, relaxation, massage, or hydrotherapy. In most cases, they have jets for massage purposes. Hot tubs are usually located outdoors, and are often sheltered for protection from the elements, as well as for privacy....

 market, at large mark-up. It may be more economically used as the concentrated product intended for swimming pools, but in amounts scaled for hot tubs (300 gal).

n-alkyl-dimethyl benzyl ammonium chloride is also used in some disinfecting products such as wipes including those made by companies such as Clorox
Clorox
The Clorox Company is a US-based manufacturer of various food and chemical products based in Oakland, California, which is best known for its bleach product, Clorox.- History :...

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