THE OXYAURA ADVANCE ORP FILTER IS AN OXIDATION REDUCTION POTENTIAL FILTER. IT IS WIDELY USED FOR REDUCING ORP VALUE OF WATER AND MAKING IT TO LOW ORP VALUE AND INCREASING ANTI-OXIDANT PROPERTIES OF WATER. SINCE THE MOVEMENT OF ELECTRONS IS ELECTRICITY , ORP IS MEASURED IN MILLIVOLTS. DRINKING WATER SHOULD HAVE A RATING OF LEAST (-)50 MV , BUT ITS NOT OFTEN THE CASE. FILTERED WATER CAN HAVE ORP VALUES RANGING FROM 357 TO (- )25 . THE LOWER THE READING , THE MORE ANTIOXIDIZING IT IS .