Hi.JN. Good question.well ...

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Hi.JN. Good question.well answered by MN. 

Just remember word CATS for purity of drnkng wtr.C clean & clear. A alkaline pH7.5.T-tasty likeable salts. S- sterile bacterias & virus.

Next set of points are

 P- physical purity use Comp. Fltr..

C- chemical constituents TDS. use RO.

B- micro bio purity sterile have UF.

For drnkng water have all 3 of them.. For industrial use.can go as required..

w wshs from Prof Ajit Seshadri. Vels U.INDIA .