WATER TREATMENT SYSTEM

PROBLEM TO BE SOLVED: To provide a water treatment system that suppresses wasteful consumption of a chemical agent by blowing processing executed during chemical-feeding processing.SOLUTION: A water treatment system includes: industrial equipment; chemical agent supply means 134; water quality detection means 133; flow rate detection means 135; blowing means; a blowing processing control part 201; a chemical agent supply control part 202; and a storage part 300. The chemical agent supply control part 202 (i) makes chemical agent supply processing stand by during execution of blowing processing and executes the chemical agent supply processing after execution of the blowing processing so as to supply the industrial equipment with a chemical agent of the necessary charge amount caused by the blowing processing, and (ii) if next blowing processing is executed during execution of the chemical agent supply processing, interrupts execution of the chemical agent supply processing and executes the chemical agent supply processing after execution of the next blowing process so as to supply the industrial equipment with the chemical agent of the total amount of the charge amount which is not supplied to the industrial equipment in the chemical agent supply processing and the necessary charge amount caused by the next blowing processing.