The influence of a constant magnetic field on water and solutions of electrolytes is investigated. As a result of effect the constant magnetic field on water watched increase of a volume of ice at 1,4% on matching by water not exposed magnetic processing. Influence positively (Na⁺, SO₄^2-) is investigated and is negative (K⁺, Cl^-) hydrated ions in solution on a volume of ice. Positively hydrated ions promote, and negatively hydrated do not promote padding increase of a volume of ice. Assumptions are put forward, that observable effects can be connected to change of transmitting movement of molecules of water in a magnetic field and a coordination force field of ions.