February 18, 2016 | Categories:

  1. electrochemical reaction causing a black stain normally found around metal fixtures or on the plaster; caused by two dissimilar metals being plumbed together or from an improper electrical grounding of pool equipment or lights
  2. decomposition of water and other inorganic compounds in aqueous solution by means of electricity; chlorine generators use this principle to produce chlorine from salt in the water
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