Home / Standards / GB 6909.1-86 GB 6909.1-86 Methods for analysis of water for boiler and cooling — Determination of hardness — High hardness 锅炉用水和冷却水分析方法 硬度的测定 高硬度 Standard Type GB ICS N/A CCS N/A Status N/A Issue Date N/A Implementation N/A Responsible Dept N/A Drafting Unit N/A