磐石县吉昌公社横道河子生产队利用砂石木炭过滤改水,三年来已初获成果。本刊在一九七四年第四期内,介绍过他们的工作经验;《自力更生,群策群力,搞好改水防病工作》。有的同志来信询问,他们改水防病效果到底如何?为了回答这个问题,本期再刊登其改水预防大骨节后效果观察一文于下。 Panshi Jichang commune Hengdaohezi production team to use sand and charcoal filter to change water, three years has already achieved initial results. The publication in the fourth period in 1974, introduced their work experience; “self-reliance, team work, improve water and disease prevention work.” Some comrades inquired whether they would change the effect of water and disease prevention and control? In order to answer this question, this issue is re-published in the next article.