Assertion: sand filter | /r/CapableOf | produce high quality water
Facets:
value: without the use of chemical aids
type: OTHER
value: very
type: DEGREE
Source sentences:
text: The first two require the use of flocculant chemicals to work effectively while slow sand filters can produce very high quality water with pathogens removal from 90% to >99% (depending on the strains), taste and odour without the need for chemical aids.
text: Slow sand filters produce high-quality water without the use of chemical aids.