The object of the present invention is to provide a granular antimicrobial agent for water treatment, which has sufficient water permeability and antibacterial effect when used as a water treatment antibacterial agent for domestic use, and which can easily grasp the duration. The solubility in 25 ℃ 0.1 ~ 1mg / g · L · hour of, Ag 2 O 0.5 to 4% by weight, K 2 O 2 to 10% by weight, SiO 2 35 to 50% by weight, the B 2 O 3 And 40 to 55% by mass of the total amount of the antimicrobial agent for water treatment which is partially hemispherical or conical in shape. In addition, the antibacterial agent was found to have high suitability for antibacterial treatment of various kinds of water treatment, especially washing water, and the invention was completed.본 발명의 과제는, 가정용의 수처리용 항균제로서 사용할 때에, 충분한 통수성과 항균 효과를 구비하고, 간단하게 지속 기간을 파악할 수 있는 수처리용 입상 항균제를 제공하는 것이다.25℃의 용해도가 0.1~1mg/g·L·시간인, Ag2O를 0.5~4질량%, K2O를 2~10질량%, SiO2를 35~50질량%, B2O3를 40~55질량% 함유하는, 형상의 일부가 반구형 또는 원추형인 수처리용 입상 항균제를 발견했다. 또, 그 항균제는 각종 수처리용, 특히 세탁 용수의 항균화에 적성이 높은 것을 발견하여, 발명을 완성했다.
