METHOD AND APPARATUS FOR DISSOLVING SOLID CHEMICAL

摘要

PROBLEM TO BE SOLVED: To provide a method for dissolving a solid chemical, which enable simple and stable management of the concentration of the solid chemical, and an apparatus. SOLUTION: The solid chemical is stored in a water-permeable vessel 202. A dissolving liquid is supplied to the vessel 202. The solid chemical is dissolved in the supplied dissolving liquid. The solid chemical-containing dissolving liquid is made to flow in a water circulating system 100. The amount of the dissolving liquid to be supplied to the vessel 202 is controlled according to the monitored concentration of the solid chemical in the system 100.