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In a method for precipitating or flocculating substances out of a solution, the solution is brought into contact with at least one ion exchange material having a surface provided with functional groups loaded with counter ions. The precipitation or flocculation is effected catalytically without exch

In a method for precipitating or flocculating substances out of a solution, the solution is brought into contact with at least one ion exchange material having a surface provided with functional groups loaded with counter ions. The precipitation or flocculation is effected catalytically without exchange of the counter ions for ions contained in the solution.

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1. A method for precipitating or flocculating a substance out of a solution, the method comprising the steps of: providing at least one ion exchange material having a surface provided with functional groups loaded with counter ions; bringing a solution into contact with the at least one ion exch

1. A method for precipitating or flocculating a substance out of a solution, the method comprising the steps of: providing at least one ion exchange material having a surface provided with functional groups loaded with counter ions; bringing a solution into contact with the at least one ion exchange material; and effecting precipitation or flocculation of a substance catalytically without exchange of the counter ions for ions contained in the solution. 2. The method according to claim 1, wherein the counter ions are cations. 3. The method according to claim 2, wherein the counter ions are selected from the group consisting of Ca2+,Fe2+,and Cu2+. 4. The method according to claim 1, wherein the counter ions comprise at least one ionic component of the substance to be precipitated or flocculated. 5. The method according to claim 4, wherein, when the solution is water, the counter ions are Ca2+ions for forming calcium carbonate crystal seeds. 6. The method according to claim 5, wherein the ion exchange material is weakly acidic. 7. The method according to claim 6, wherein the functional groups are carboxyl groups (COO-) carrying the counter ions. 8. The method according to claims 7, wherein the counter ions are Ca2+. 9. The method according to claim 1, further comprising the step of exposing the surface of the ion exchange material in contact with the solution to an electrical field. 10. The method according to claim 9, wherein the electrical field is adjustable. 11. The method according to claim 9, further comprising the step of arranging electrical field-generating electrodes in or on the ion exchange material such that the solution is not present between the electrical field-generating electrodes. 12. The method according to claim 1, further comprising the step of circulating the solution along the ion exchange material or through the ion exchange material. 13. The method according to claim 1, further comprising the step of passing the solution along or through the ion exchange material and guiding the solution additionally through a physical water treatment device. 14. The method according to claim 1, wherein the solution to be treated is water. 15. The method according to claim 1, wherein the ion exchange material is comprised of polyacrylate, polystyrene or active carbon and wherein a surface of the polyacrylate, polystyrene or active carbon carries the functional groups. 16. The method according to claim 1, further comprising the step of removing the precipitated or flocculated substance from the solution. 17. The method according to claim 1, wherein the precipitated or flocculated substance forms seed crystals.