supply of disinfectant materials for purification of drinking water at shalateng garrison:-supply only alum ferric as feal ( so4 ) 3 ( nh4 ) so4 x h2o , solid block , ph of 5% aqueous solution 2 . 7 , 16% soluble alumina content and off white colour confirming to is:299-2012 , gde-iv for sedimentation of raw water complete all as specified and as directed . , supply only calcium based high strength chlorination chemical ( calcium hypo chlorite ) for disinfectant in granular form in factory sealed hdpe container ( 40 to 50 kg each ) having chlorine concentration level of 65-70% complete all as specified and as directed . notes:- ( a ) stability: projected self life of chlorination chemical must be one year with minimum loss of chlorine . ( b ) operational considerations: must be safe to use in terms of level of insoluble components . there must be no risks relating to encrustations in equipment and pipe lines , no sludge generation , no hard water scaling in supply water . ( c ) operator health consideration: chlorination chemical must contains acceptable levels of granular size to avoid risks to operator from health safety point of view . ( d ) the brand and make of the chlorination chemical must be stated and certified by all india institute of hygienic & public health not earlier than 2008 , confirming compliance to all the above specifications with a declaration from the laboratory that from the technical strength , stability , health safety and operational point of view as well as the fact that this product is used for drinking water applications for consumption by humans . the brand and make of calcium based granular chlorination chemical is suitable for drinking water chlorination and is recommended for use . the report must indicate that the sample has been drawn by all india institute of hygienic & public health . make :- aquafit from shree rayalaseema hi-strength hypo ltd . kurnool ( ap ) / purichlor or any other equivalent e-in-c approved brand as approved by age ( i ) .