It is an international maritime convention for marine pollution. It came in 1973 while major amendment has adopted between 1976 and 1978 due major oil spillage of oil tanker s. And hence it is called 73/78.
1. Open up the purifier and place the blind disc at the bottom of disc stack. 2. The water outlet is blocked by seal on the gravity disc. 3. Blank off sealing water inlet line .
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