31. Specification for sodium carbonate (technical grades). (30th November 1981) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (8 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
32. Tracked Changes. Chemicals used for the treatment of swimming pool water. Iron based coagulants. (19th August 2022) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (42 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
33. Tracked Changes. Chemicals used for treatment of water intended for human consumption. Iron (II) sulfate. (27th February 2023) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (66 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
34. Tracked Changes. Chemicals used for treatment of water intended for human consumption. Iron (III) chloride. (27th February 2023) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (74 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗