Water treatment resin is divided into cation resin and anion resin, cation resin is further subdivided into sodium type and hydrogen type, sodium type resin exchanges calcium and magnesium ions in water into sodium ions to soften the water. Hydrogen resin is to exchange calcium and magnesium ions in water into hydrogen ions to soften the water. Anion resin contains replaceable hydroxide ions, which can replace acid ions in water. At the same time, the use of anion resin and hydrogen cation resin can make the water soften. Water becomes pure water.
