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