Quartz sand filter material is introduced
the first: because the strength of the river sand is small, after a quartz sand filter backwashing is washed, river sand will wear into fine particles, not only can't get to the filtering effect, it will pollute the water, filtered water turbidity.
the second: river sand particles generally commonly irregular, and the general river sand particle size is small, it is easy to jam filter. Third:
general Yellow River sand color, yellow also suggests that there are other impurities, if inappropriate for purifying water.
and quartz sand with high strength, uniform particles, color white, colour and lustre is relaxed, but if the poor quartz sand is not talked about.
the above information by source water treatment filter out through years of experience, specific can see WWW. 571年水。 Com, or call the advisory.