Water softener

Abstract

Provided is a water softening apparatus including: soft water tank that softens raw water containing a hardness component with weakly acidic cation exchange resin to generate acidic soft water; neutralization tank that neutralizes a pH of the acidic soft water passed through soft water tank with weakly basic anion exchange resin to generate neutralized soft water; and controller that controls a regeneration process that is a process of regenerating at least one of weakly acidic cation exchange resin and weakly basic anion exchange resin. Controller includes an adsorption amount specification unit that specifies a hardness component adsorption amount in the soft water tank from hardness of the raw water, a water amount of the raw water passed through the soft water tank, and hardness of water after passing through the soft water tank, process and during the regeneration process, based on the hardness component adsorption amount specified by the adsorption amount specification unit, controller controls the regeneration process to be continued in a case where the hardness component adsorption amount is more than or equal to a reference value and to be ended in a case where the hardness component adsorption amount is less than the reference value.

Dependencies are inferred from the claim text.