A process for producing an aqueous suspension of precipitated calcium carbonate comprising the steps of: i) providing a calcium oxide containing material, ii) providing at least one water-soluble polymer having a molecular weight M w in the range from 200 to 6500 g/mol, wherein the at least one polymer has the chemical structure of formula wherein n, m, and p are integers and at least one of n, m, or p is greater than zero and n+m+p is less than or equal to 70, R 1 is H or CH 3, R 2 is H or CH 3; R 3 is -C(=O)-O-R 4 or -C(=O)-NH-R 4, wherein R 4 is a C 1 to C 20 alkyl group, a C 3 to C 20 cycloalkyl group and/or a C 6 to C 30 aryl group, being optionally substituted with one or more sulfonate groups, and wherein the cycloalkyl group and/or the aryl group comprises one ring or several rings, which are linked to each other, and X is H and/or M, wherein M is Na, K, Li, Mg, and/or Ca, and wherein the structural units are arranged randomly, regularly and/or in blocks, iii) providing at least one slaking additive, wherein the at least one slaking additive is selected from the group consisting of organic acids, organic acid salts, sugar alcohols, monosaccharides, disaccharides, polysaccharides, gluconates, phosphonates, lignosulfonates, and mixtures thereof, iv) preparing a milk of lime by mixing water, the calcium oxide containing material of step i), the at least one polymer of step ii), and the at least one slaking additive of step iii), wherein the calcium oxide containing material and the water are mixed in a weight ratio from 1:2.5 to 1:6, and v) carbonating the milk of lime obtained from step iv) to form an aqueous suspension of precipitated calcium carbonate, wherein the obtained suspension of precipitated calcium carbonate has a solids content from 20 to 50 wt.-%, based on the total weight of the suspension. i) providing a calcium oxide containing material, ii) providing at least one water-soluble polymer having a molecular weight M w in the range from 200 to 6500 g/mol, wherein the at least one polymer has the chemical structure of formula wherein n, m, and p are integers and at least one of n, m, or p is greater than zero and n+m+p is less than or equal to 70, R 1 is H or CH 3, R 2 is H or CH 3; R 3 is -C(=O)-O-R 4 or -C(=O)-NH-R 4, wherein R 4 is a C 1 to C 20 alkyl group, a C 3 to C 20 cycloalkyl group and/or a C 6 to C 30 aryl group, being optionally substituted with one or more sulfonate groups, and wherein the cycloalkyl group and/or the aryl group comprises one ring or several rings, which are linked to each other, and X is H and/or M, wherein M is Na, K, Li, Mg, and/or Ca, and wherein the structural units are arranged randomly, regularly and/or in blocks, wherein n, m, and p are integers and at least one of n, m, or p is greater than zero and n+m+p is less than or equal to 70, R 1 is H or CH 3, R 2 is H or CH 3; R 3 is -C(=O)-O-R 4 or -C(=O)-NH-R 4, wherein R 4 is a C 1 to C 20 alkyl group, a C 3 to C 20 cycloalkyl group and/or a C 6 to C 30 aryl group, being optionally substituted with one or more sulfonate groups, and wherein the cycloalkyl group and/or the aryl group comprises one ring or several rings, which are linked to each other, and X is H and/or M, wherein M is Na, K, Li, Mg, and/or Ca, and iii) providing at least one slaking additive, wherein the at least one slaking additive is selected from the group consisting of organic acids, organic acid salts, sugar alcohols, monosaccharides, disaccharides, polysaccharides, gluconates, phosphonates, lignosulfonates, and mixtures thereof, iv) preparing a milk of lime by mixing water, the calcium oxide containing material of step i), the at least one polymer of step ii), and the at least one slaking additive of step iii), wherein the calcium oxide containing material and the water are mixed in a weight ratio from 1:2.5 to 1:6, and v) carbonating the milk of lime obtained from step iv) to form an aqueous suspension of precipitated calcium carbonate,