ওয়ার্ম টিপস টিপস আপনার হিথ অফ ওয়াটার কোয়ালিটি টেস্টারের জন্য

TDS valve low, safety for health but no nutrition: TDS high, more nutrition contents but not safety for health.The safety standard of U.S.A water quality of TDS value is 0ppm 50ppm, for European standard is 0 70ppm, China national standard is not more than 500ppm. The generation description of TDS is the total dissolved solids of water, higher value means the chow