Reference

Purification of water

Purification of water. Hemming, Malcolm Lisle; Smith, Malcolm Robert; Singer, Michael (Imperial Chemical Industries Ltd., Engl.). Ger. Offen. DE 2704334 25 Aug 1977, 14 pp. Addn. to Ger. Offen. 2,522,792. (German). (Germany). CODEN: GWXXBX. CLASS: IC: C02B001-20. PRIORITY: GB 76-4409 4 Feb 1976. DOCUMENT TYPE: Patent CA Section: 61 (Water) A polymeric biguanide [56-03-1], e.g. poly(hexamethylenebiguanide), under the tradename Vantocil IB [32289-58-0] is recommended as a flocculating agent for clarifying waters of suspended solids.

Method for the destruction of aquatic molluscs

Method for the destruction of aquatic molluscs. Allan, Lionel V.; Hinton, Anthony J. (Imperial Chemical Industries Ltd., Engl.). Brit. GB 1464005 9 Feb 1977, 4 pp. (English). (United Kingdom). CODEN: BRXXAA. CLASS: IC: A01N009-20. APPLICATION: GB 74-17492 22 Apr 1974. DOCUMENT TYPE: Patent CA Section: 5 (Agrochemicals) Section cross-reference(s): 14 Polymeric biguanides were aquatic molluscicides, being active against Biomphalaria glabrata, the snail host in bilharziasis transmission. E.g., as little as 0.5 ppm poly(hexamethylene biguanide)-HCl [32289-58-0] (av. mol. wt.) was effective in killing the embryos of B. glabrata after a 4-day exposure period.