Water Purification & Filtration Dictionary

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An alphabetical listing of General terms and items.

H20   Dico Tools
The chemical formula for water (dihydrogen oxide).


Half -life   Dico Tools
The time required for half of the substance present at the beginning to dissipate or disintegrate.


Halogens   Dico Tools
A family group pf elements including bromine, chlorine, fluorine, astatine and iodine.


Hardness   Dico Tools
A common quality of water which contains dissolved compounds of calcium and magnesium and sometimes other divalent and trivalent metallic elements.


Health Contaminant   Dico Tools
Any substance or condition that may have any adverse effect on human health.


Heterotrophic Plant Count (HPC)   Dico Tools
A procedure for estimating the total number of live non photosynthetic bacteria in water. Colony forming units (CFU) are counted after spreading the sample over a membrane or spread plate and incubating in an amiable growth medium (agar) and at an amiable temperature. These are generally not considered disease-causing bacteria.


Hexametaphosphate   Dico Tools
A chemical such as sodium hexametaphosphate, added to water to increase the solubility of certain ions and to deter precipitation of certain chemicals.


Hydrostatic Test   Dico Tools
A pressure test procedure in which a vessel or system is filled with water, purged of air, sealed , subjected to water pressure and then observed and/or tested for leaks, distortion and/or mechanical failure.



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