After school hours he continued actively his Swimming coaching at various swimming pools and clubs. He trained many swimmers who won Laurels at the National and International Level. He was also very actively involved at the National Aquatics as a Technical official and Water polo referee since 1976.
When the Government of India decided to hold Asian Games in 1982 at Delhi, at the time India did not have any International Water polo Referee. Mr. Pahuja then decided to qualify as International Water polo Referee. In 1980, he got a chance to qualify at Chendu- (China) in the friendship Water polo Tournament held at Chendu. He became the first and only one International Water polo Referee in the country in 1980. As the Asian Games came closer, India needed more Technical Officials, so the Swimming Federation of India organized a clinic for Technical officials in Swimming, Diving and Water polo in New Delhi in 1982 with the help of F.I.N.A. –International Body which controls the Swimming, Water Polo, and Diving in the world.
International Water Polo Referee he got the Chance to refer in the 4th World Championship at Equator-1980, Asian Games, Delhi 1982, World Junior Water polo Tournament-Barcelona, Spain 1983 and Asian Swimming Championship-South Korea in1984.
One of his biggest contributions to the field of swimming was the Swimming Statistical Bulletin, which is acknowledged as the bible for swimming in India (by Hindu newspaper). Swimming Statistical Bulletin is a solitary book of Swimming Statistics that is considered very useful for swimmers, coaches, Administrators, Ministry of Sports, S.A.I. It helps to clear Swimmers for the participation in the International championships. Indian Olympic Association also uses this as a reference book.