@techreport{oai:soar-ir.repo.nii.ac.jp:00016837,
 author = {中本,  信忠 and 坂井,  正},
 month = {Mar},
 note = {Odor problem of tap water occured in Ueda city in 1973. It was caused by the pre-chlorination of ap re-treatment of slow sand filteration. After stopping the pre-chlorination，o dor problem disappeared. During the agricultural period，al gal mat of filamentous diatom develops on the bed of slow sand filters. When slow sand filter became a continuous culture system of filamentous diatom in warm period，the filter did not easily clogged. However，th e pre-chlorinated filter in 1979 was easily clogged. The development of algal mat in slow sand filters is beneficia, Article, 環境科学年報18:69-74(1996)},
 title = {1973年の上田市水道水の異臭味問題と前塩素処理と緩速ろ過池の藻類被膜の発達},
 year = {1996}
}