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residual andfor no less fkan twnV*ur (24) hours as <br />it F. <br />2 The City reserves the right to run performance tests once <br />a month. <br />,rATJ , =17 <br />Fb��Oyjo <br />i. These specifications cover pyrophosphate compounds used to stabilize ir <br />sequester soluble iron and manganese in potable water. <br />i. Product shall be a granular form. Powdered material wfll riot be a4 <br />"71 <br />F. PHYSICAL STANDARDS <br />2. Solubility: Completely misdble in miater <br />3. Percent PhOSphWe as PN AfisnimumqfM <br />�M <br />i. Phosphate blend shall contain only NSP approved phosphorous ftwedients. <br />No amines or other dwlating agents WWI be used. <br />Eii, Blended phosphate product formulation shall be only sodium salts of <br />phosphate compounds. <br />iv. No potassium salts WWI be used. <br />V. impurities in pyrophosphate products shall not exceed the following <br />concentrations: <br />