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. Each Block should be
embossed with ISI Mark & PHED (letter size-7cm x 5 cm).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.
