Blanket weed of Slow Sand Filter to make safe drinking water in summer Blanket weed is remarkable in Thames water in summer. Pioneer plant of filamentoud diatom was grazed, then filamentoud green alga of Cladophora appeared due to grazing by midge larvae. This succession speed was influenced with the temperature.
Internet text through JICA(Japan International Cooperative Agency);
http://jica-net.jica.go.jp/lib2/08PRDM007/index.html
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