Mineral conversion reservoir

摘要

PROBLEM TO BE SOLVED: To keep the quality of improved water constant even when the activity of an improving agent is decreased. ;SOLUTION: A first control means 312 having a water quality improving circulation means 7 aperated for a prescribed time according to the setting of a water quality improving mode is provided together with a discriminating means 313 for discriminating the change in capability of an improving material of a water quality improving device, and a second control means 314 for setting the prescribed time long according to the discriminated lowering of capability of the improving material to prolong the treating time under the water quality mode according to the lowering of capability of the improving material.;COPYRIGHT: (C)1997,JPO