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H

Hardness

The ability of water to neutralize soap, due to the presence of cations such as calcium and magnesium; usually expressed as parts per million equivalents of calcium carbonate. Refers to the calcium and magnesium ion concentration in water on a scale of very soft (0-20 ppm as CaCO3), soft (20-50 ppm), hard (50-500 ppm) and very hard (55+ ppm).

HACCP

A mandatory Food and Drug Administration (FDA) seafood inspection program required by fish processors, wholesalers, and retailers.

Hybrid

Progeny resulting from a cross between parents that are genetically unlike.

Hydrogen Ion Concentration

The cause of acidity in water. See pH.

Hydrogen Sulfide

An odorous, soluble gas, H2S, resulting from anaerobic decomposition of sulfur-containing compounds, especially proteins.