One tablet sterilised the water, the other took away the chlorine type taste.Item belonged to Billy Bird No VX113169 2/14 Batt AIF. Refer 1601. .1) & .2) Metal tin with black metal lid, contains 2 glass tubes with cork stoppers. .3) Glass tube containing 50 blue tables. .4) Glass tube containing 50 white tables. .2) Lid: Sterilising Outfit for use with water bottles (Keep Dry). Instructions for use on underside of lid. .3) x 50 Thio tables. .4) x 50 Sterilising tables.containers - military, medicine - pharmacy, water sterilization