Preselection. The particle size of cation exchange resin is generally controlled at 20-35 meshes, and some can reach 50 meshes. Therefore, before use, drying, crushing and sieving should be carried out first.

The function principle of the cation exchange resin is to use its own functional group to react with the positive ions in the water, dsorb the ions in the water to its own surface, and achieve the purpose of purification from the surface.

The anion exchange resin has the same organic skeleton as the cation exchange resin, but introduces dissociatable basic groups, such as - NH, - NH, - NHR, etc.

Strong-base anion exchange resin: it mainly contains strong reaction groups such as - N+(CH3) 3 with tetrahedral ammonium salt functional group