Matches in DBpedia 2016-04 for { ?s ?p "Sand filters are used for water purification. There are three main types; rapid (gravity) sand filters upflow sand filters slow sand filtersAll three methods are used extensively in the water industry throughout the world. The first two require the use of flocculant chemicals to work effectively while slow sand filters can produce very high quality water free from pathogens, taste and odour without the need for chemical aids."@en }
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- Sand_filter abstract "Sand filters are used for water purification. There are three main types; rapid (gravity) sand filters upflow sand filters slow sand filtersAll three methods are used extensively in the water industry throughout the world. The first two require the use of flocculant chemicals to work effectively while slow sand filters can produce very high quality water free from pathogens, taste and odour without the need for chemical aids.".
- Q1527878 abstract "Sand filters are used for water purification. There are three main types; rapid (gravity) sand filters upflow sand filters slow sand filtersAll three methods are used extensively in the water industry throughout the world. The first two require the use of flocculant chemicals to work effectively while slow sand filters can produce very high quality water free from pathogens, taste and odour without the need for chemical aids.".
- Sand_filter comment "Sand filters are used for water purification. There are three main types; rapid (gravity) sand filters upflow sand filters slow sand filtersAll three methods are used extensively in the water industry throughout the world. The first two require the use of flocculant chemicals to work effectively while slow sand filters can produce very high quality water free from pathogens, taste and odour without the need for chemical aids.".
- Q1527878 comment "Sand filters are used for water purification. There are three main types; rapid (gravity) sand filters upflow sand filters slow sand filtersAll three methods are used extensively in the water industry throughout the world. The first two require the use of flocculant chemicals to work effectively while slow sand filters can produce very high quality water free from pathogens, taste and odour without the need for chemical aids.".