Method for reducing calcium content in a liquid hydrocarbonaceous medium having a calcium content of greater than 30ppm calcium based upon one million parts of said liquid hydrocarbonaceous medium comprising: a. contacting said liquid hydrocarbonaceous medium with a citric acid sequestering agent to form a sequestered calcium citrate complex; b. contacting said liquid hydrocarbonaceous medium with an aqueous medium to form an emulsion whereby upon resolution of said emulsion at least a portion of said sequestered calcium citrate complex remains in said aqueous medium; and c. contacting said aqueous medium with from 1 to 300ppm of a water soluble or water dispersible polymer having the formula I, based on one million parts of said aqueous medium, to inhibit calcium deposit formation therein or along surfaces in contact with said aqueous medium, wherein said polymer has the formula: wherein E is the repeat unit remaining after polymerization of an ethylenically unsaturated compound; R 1 is H or lower (C 1 -C 6) alkyl; G is lower (C 1 -C 6) alkyl or carbonyl; Q is O or NH; R 2 is lower (C 1 -C 6) alkyl; hydroxy lower (C 1 -C 6) alkyl, lower (C 1 -C 6) alkyl sulfonic acid -(Et-O)- n -(iPr-O)- n or -(Pr-O-) n wherein n ranges from 1 to 100 alkyl, and R 3 is H or XZ wherein X is an anionic radical selected from the group consisting of SO 3, PO 3 or COO; Z is H or hydrogens or any other water soluble cationic moiety which counterbalances the valence of the anionic radical X; F, when present, is a repeat unit having the Formula II: wherein X and Z are the same as in Formula I; R 4 is H or (C 1 -C 6) lower alkyl, R 5 is a hydroxy substituted alkyl or alkylene having from 1 to 6 atoms, and XZ may or may not be present; c and d are positive integers, e is a non-negative integer, and j is 0 or 1. a. contacting said liquid hydrocarbonaceous medium with a citric acid sequestering agent to form a sequestered calcium citrate complex; b. contacting said liquid hydrocarbonaceous medium with an aqueous medium to form an emulsion whereby upon resolution of said emulsion at least a portion of said sequestered calcium citrate complex remains in said aqueous medium; and c. contacting said aqueous medium with from 1 to 300ppm of a water soluble or water dispersible polymer having the formula I, based on one million parts of said aqueous medium, to inhibit calcium deposit formation therein or along surfaces in contact with said aqueous medium, wherein said polymer has the formula: wherein E is the repeat unit remaining after polymerization of an ethylenically unsaturated compound; R 1 is H or lower (C 1 -C 6) alkyl; G is lower (C 1 -C 6) alkyl or carbonyl; Q is O or NH; R 2 is lower (C 1 -C 6) alkyl; hydroxy lower (C 1 -C 6) alkyl, lower (C 1 -C 6) alkyl sulfonic acid -(Et-O)- n -(iPr-O)- n or -(Pr-O-) n wherein n ranges from 1 to 100 alkyl, and R 3 is H or XZ wherein X is an anionic radical selected from the group consisting of SO 3, PO 3 or COO; Z is H or hydrogens or any other water soluble cationic moiety which counterbalances the valence of the anionic radical X; F, when present, is a repeat unit having the Formula II: wherein X and Z are the same as in Formula I; R 4 is H or (C 1 -C 6) lower alkyl, R 5 is a hydroxy substituted alkyl or alkylene having from 1 to 6 atoms, and XZ may or may not be present; c and d are positive integers, e is a non-negative integer, and j is 0 or 1.