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<br />,2, <br /> <br />.,' <br />(;1 <br />o <br /> <br /> <br />, . <br /> <br />the problem was due to defective manufacture of the filters. The dual <br />18 inch sand filters. upon being placed in service, began to throw fine <br />sand particles fon~ard into the final filter. It was found that the <br />larger filter media had not been properly cemented in place. Repair to <br />the filters was delayed until after the irrigation season because the <br />repair time would interrupt the irrigation schedule. During the interim <br />an addition of coarse sand was found to reduce the problem. <br /> <br /> <br />II. <br />