Non-Elec­tric Stor­age

Pu­rity Not Guar­an­teed in All Brands

Consumer Voice - - Comparative Test -

BA wa­ter pu­ri­fier is meant to re­move the most com­mon im­pu­ri­ties found in drink­ing wa­ter in­clud­ing bac­te­ria, chlo­rine, heavy metals (such as mer­cury, cop­per, and lead), pes­ti­cides and her­bi­cides. There is no over­stat­ing the im­por­tance of choos­ing a suit­able wa­ter pu­ri­fier and the var­i­ous safety is­sues that ac­com­pany it. Lower ini­tial costs, rea­son­ably good per­for­mance and over­all con­ve­nience have en­sured that the non-elec­tric stor­age-type, chemical-based wa­ter pu­ri­fiers re­main a pop­u­lar choice, de­spite fac­tors such as vary­ing de­grees of ef­fi­ciency in terms of out­put wa­ter, cost of re­fill/car­tridge and an­nual main­te­nance sup­port. It was time for Con­sumerVoice to as­sess the cost–util­ity–ef­fec­tive­ness pa­ram­e­ters of these vi­tal fix­tures in to­day’s homes. ased on the reg­u­lar sell­ing brands across the coun­try, we con­ducted com­par­a­tive test­ing (CT) of 10 pop­u­lar brands of non-elec­tric stor­age wa­ter pu­ri­fiers. We de­vel­oped the test pro­gramme in­clud­ing some key tests as per the guide­lines based on rel­e­vant Bureau of In­dian Stan­dards. The test­ing was con­ducted as per stan­dard test meth­ods and also as per the claims of the brands and other re­lated re­quire­ments ap­pli­ca­ble to the prod­uct for test­ing. Apart from the es­sen­tial gen­eral ef­fi­ciency and chemical tests, the pu­ri­fiers un­der­went two crit­i­cal tests for tur­bid­ity and E. coli to judge them on phys­i­cal and mi­cro­bial safety. All types of wa­ter pu­ri­fiers are ex­pected to ef­fec­tively re­move the phys­i­cal and mi­cro­bial im­pu­ri­ties/ con­tam­i­na­tions from the in­put chal­lenge wa­ter so

that users are as­sured of safe and potable drink­ing wa­ter dur­ing the rated life/ef­fec­tive­ness pe­riod. The des­ig­nated test lab­o­ra­tory con­ducted the var­i­ous tests on masked and coded sam­ples. Bureau of In­dian Stan­dards has laid down spec­i­fi­ca­tions for ce­ramic wa­ter fil­ter can­dles for drink­ing wa­ter vide IS: 7402 – 1986 (amended from time to time). These fil­ters re­move sus­pended mat­ters and bac­te­ria but are not ex­pected to fil­ter dis­solved solids or chem­i­cals. Note that in­ter­pre­ta­tion of re­sults is based on IS: 10500 spec­i­fi­ca­tion for drink­ing wa­ter. These days there are var­i­ous other cat­e­gories of wa­ter fil­ters/pu­ri­fiers that in­cor­po­rate lat­est tech­nolo­gies of UV (ul­tra vi­o­let) and R/O (re­verse os­moses), whereby a large num­ber of im­pu­ri­ties and un­de­sir­able min­er­als, solids and other per­ma­nent im­pu­ri­ties can be re­moved, par­tic­u­larly by R/O sys­tem. Bureau of In­dian Stan­dards had some years back in­tro­duced the In­dian stan­dard for wa­ter pu­ri­fiers in­cor­po­rat­ing UV tech­nique in IS: 14724: 1999.

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