supply of hydrated lime at morigaon jorhat hojai dibrugarh for 2021 22 supply of hydrated lime to be delivered at phe stores at morigaon jorhat hojai dibrugarh for the fy 2021-22 , supply of isi marked ferric alum ( alumino ferric ) conforming to is:299 / 2012 ( grade 4 ) with up to date amendment and suitable for purifying drinking water of 25 k.g. naked slab. the colour of grade 4 ferric alum to be supplied should be pale yellow to light brown as per amendment no.1 february 2015 to is 299: 2012 alumino ferric- specification. each block should be embossed phed ( letter size-7cm x 5 cm ) to be delivered at phe stores of jorhat, hojai, dibrugarh & morigaon division at jorhat, hojai, dibrugarh & morigaon