7.—(1) After bottling, the total colony count of the water at source may not exceed—
(a)100 per ml at 20 to 22 oC in 72 hours on agar-agar or an agar-gelatine mixture; and
(b)20 per ml at 37 oC in 24 hours on agar-agar.
(2) The total colony count shall be measured within the period of 12 hours following bottling, the water being maintained at 4 oC +/- 1 oC during the period before which it is measured.