| 摘要 |
PURPOSE:A water treating agent, containing at least one compound capable of releasing ions having water purifying and bacteriostatic action in an aqueous solution, i.e. heavy metal ions or alkali metal ions in glass and capable of readily preventing occurrence of bacteria or algae. CONSTITUTION:A water treating agent consisting essentially of a soda based or soda-lime based glass (particularly glass consisting of 10-40wt% Na2O, 0-80wt% SiO2 and 0-30wt% B2O3) and/or phosphoric acid based glass (particularly glass consisting essentially of 10-40wt% Na2O, 20-70wt% P2O5, 0-70wt% SiO2 and 0-30wt% B2O3) containing at least one compound capable of releasing heavy metal ions, particularly preferably silver ions and alkali metal ions, e.g. Na, Li, K, etc. EFFECT:Bacteria and algae can be stably controlled by simple operation for a long period.
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