4CHAN SPAM FILTER

Commercial Sand Filters

sand filters


(Sand Filter) Uses sand to collect debris from water running through it.


A filter used in water purification and consisting of layers of sand arranged with coarseness of texture increasing downward


(Sand filter) Sand filters are used for water purification. There are three main types; # rapid (gravity) sand filters # upflow sand filters # slow sand filters


(Sand Filter) A filtration system that removes contaminants by forcing the water through a vessel of sand.  These require backwashing about once a month and have no need for replacement chemicals.

commercial


Making or intended to make a profit


a commercially sponsored ad on radio or television


Concerned with or engaged in commerce


Having profit, rather than artistic or other value, as a primary aim


connected with or engaged in or sponsored by or used in commerce or commercial enterprises; "commercial trucker"; "commercial TV"; "commercial diamonds"


The typographic character @, called the at sign or at symbol, is an abbreviation of the word at or the phrase at the rate of in accounting and commercial invoices (e.g. "7 widgets @ $2 = $14"). Its most common modern use is in e-mail addresses, where it stands for "located at".