WATER TEST FOR COLIFORMS AND ESCHERICHIA COLI; 10 ML SAMPLE; SHELF LIFE: UP TO 15 MONTHS AT 2 TO 30 DEG C; SAMPLE TURNS YELLOW WHEN COLIFORMS ARE PRESENT; FLUORESCES TO INDICATE THE PRESENCE OF E. COLI; TIME TO RESULTS: 24 HOURS; MOST PROBABLE NUMBER (MPN) SCREW-CAPPED TEST TUBES; PACKAGE OF 200