Patent ID: 8617402

Claim:
A method for raising the pH of a body of water wherein said body of water has a pH of less than 4.5; said method comprises: using at least one neutralizing agent and raising the pH in at least two stages; when said body of water has a pH of less than 4.5, a first neutralizing agent with a final conductivity of, at most, 100 Î¼S/cm, is added to said body of water, and after reaching a pH of at least 4.5, a second neutralizing agent in the form of materials originating from lime, with a final conductivity of more than 100 Î¼S/cm is introduced into the body of water, the final conductivity of the neutralizing agents being determined as the conductivity of an aqueous neutralizing agent suspension or solution in solution equilibrium at 25Â° C. with a neutralizing agent content of 0.015% by weight and the neutralizing agent being introduced at pH values of less than 4.5 in the form of a suspension at a concentration of 2.0 to 15% by weight, and at pH values of at least 4.5 being introduced in the form of a suspension having a concentration of 0.05 to 2% by weight, into the body of water.