Had any snow built up on the aircraft? (Significant amount?) While i cant comment on the A330 as i have never de-iced one.. on smaller jets such as the 737/A319/A320/A321 in frost between 150-230ltrs, in falling snow in which much hasnt built up between 300-400ltrs, in heavy snow in which theres about an inch of snow on the wings/fuselage (when the crew dont want to wait for it to be brushed) 550-750ltrs.. the above figures are what i personally use, i know some who use more or less..i did use 1800ltrs once on an A300 which was covered in snow
At the end of the day, everyone uses different amounts of fluid, some people use different spray settings.. ive seen 1200ltrs go on a 737-700 before in heavy snow. The way i see it is, if im signing for it, ill use as much as im happy with to be satisfied that the aircraft is ice/frost/snow free and safe for flight and if anyone pulls the old "cost" line which hasnt happened to me yet, ill set them straight