Consumer Voice - - Comparativ­e Test -

E. coli

E. coli | Tur­bid­ity

Mi­cro­bi­o­log­i­cal con­tam­i­na­tion of wa­ter has long been a con­cern of the pub­lic. Many in­fec­tious micro­organ­isms found in the en­vi­ron­ment – in­clud­ing shigella, escherichi­a coli, sal­mo­nella, s. au­reus, yeast and mould – can cause symp­toms such as nau­sea, vom­it­ing, di­ar­rhoea and stomach cramps. While con­duct­ing this test, E. coli was spiked in the in­put chal­lenge wa­ter at reg­u­lar in­ter­vals of 300, 600, 900 and 1,200 litres of var­i­ous con­cen­tra­tions. Spik­ing level was kept higher to check ef­fi­cacy of the prod­uct in worst/ad­verse con­di­tions. The out­put wa­ter was tested to check the ef­fi­cacy of the fil­ter.


This refers to the amount of dis­solved solid par­ti­cles that are sus­pected to be in wa­ter and that cause light rays shin­ing through the wa­ter to scat­ter. Thus, tur­bid­ity makes the wa­ter cloudy or even opaque in ex­treme cases. The tur­bid­ity of drink­ing wa­ter should not be more than 3 NTU and ideally be be­low 1 NTU. This is a key qual­ity in­di­ca­tor for a wa­ter fil­ter/pu­ri­fier and the test was con­ducted as per the re­quire­ments of IS: 7402. All the brands of wa­ter pu­ri­fiers were able to re­move tur­bid­ity to a level that makes it safe and suit­able for drink­ing.

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