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Single-Pass Sand Filter <br /> <br />Advantages <br />· Easy to construd: <br /> <br />· Low operator needs <br /> <br />· Reliable <br /> <br />· Possible insitu replacement <br /> <br />Disadvantages <br />, Largerarea required <br /> <br />· High construction cost <br /> <br />· Aesthetics unpleasant <br /> <br />· Cleaning of surface may be <br /> required <br /> <br />Recirculating Gravel Filter <br /> <br />6 <br /> <br /> <br />