OCR Text |
Show CISTERN FILTERS DO NOT REMOVE GERMS Cisterns that aro properly construe ted nnd receive rain water from roofs generally affcrd water of good sanitary sani-tary quality, but If wator of doubtful quality Is stored In clstorns tho supply sup-ply Is of courso not safo for domestic domes-tic uso. Filters used In connection with cisterns aro of valuo in making mak-ing the water clear but aro generally general-ly of no valuo In removing disease germs. Many clstorns nro divided In to two parts by n brick wall, tho water wa-ter being admitted Into ono compartment compart-ment and drawn from the other. In such clstorns tho water passes thru tho brick nnd In that way.ls Improved In clearness and color, but not generally gen-erally In Banltary quality. U. S Geological Survey. |