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Pretreatment alternatives <br />~41are now available. <br /> <br />· Aerobic Systems <br /> <br />· Single Pass Sand Filter <br /> <br />· Recirculating Gravel Filter <br /> <br />· Subsurface Flow Constructed Wetland <br /> <br />Aerobic Systems <br /> <br />Advantages <br />· Very small area <br />· In-situ replacement <br /> <br />· Many units to choose frorfl <br /> <br />Disadvantaqes <br />· High O&JVl <br /> <br />· Shockload potential <br /> <br />· Possible odors and noise <br /> <br />· Requires trained <br /> operator/contractor <br /> <br />· Requires housing for blower <br /> <br />4 <br /> <br /> <br />