The fully automatic water softener adopts the FLECK fully automatic controller from the United States to control the equipment's fully automatic operation, and uses sodium type cation resin for exchange reaction. When the raw water enters the water softener through a multi way valve, the calcium and magnesium ions (i.e. hardness) in the raw water will react with the sodium ions in the cation exchange resin, causing the calcium and magnesium ions in the water to be adsorbed by the sodium ions, thus achieving a softening effect. Its chemical reaction formula is [2RNa+Ca²⁺( Mg²⁺)=R₂Ca(Mg)+2Na⁺]When the calcium magnesium type ions (i.e. ineffective ions) reach a certain level, the hardness of the effluent increases, and it is necessary to use concentrated sodium chloride solution for regeneration and replacement reaction to restore the ions to the sodium type. Its chemical reaction formula is [R]₂Ca+2Na⁺=2Rna+ Ca²⁺]During the reaction process, the water softener will automatically backwash (loosen the resin to facilitate a more thorough reaction between the concentrated salt solution and sodium ions), absorb salt for regeneration, and perform slow cleaning (fully displace the saturated salt solution with sodium ions while performing slow cleaning to remove the hardness in the water) through the control of the FLECK multi way valve. Fast flushing and salt water re injection will be used to flush out residual hardness and salt content in the water, and water will be injected into the salt tank to prepare for the next regeneration.