Slow sand filter sand for water supply

Effective against cryptosporidiosis! Introduction of high-quality filter sand containing a lot of quartz.

"Slow sand filter sand" is the filtration sand used in slow sand filtration ponds. The slow sand filtration method is a historically significant filtration technique adopted when modern water supply systems began in London in the early 19th century. It produces high-quality drinking water at a slow filtration rate of 4 to 5 meters per day. According to the Japan Water Works Association standards, the effective diameter representing the grain size must be between 0.30 and 0.45 mm, and the uniformity coefficient representing the grain consistency must be 2.0 or lower. Only those that pass product testing are shipped to water purification plants across the country. 【Features】 ■ Low content of impurities, flat or weak sand, and sand iron ■ Washing turbidity is below 30 degrees ■ Density is between 2.57 and 2.67 g/cm3 ■ Loss on ignition is 1.3% or lower ■ Friction rate is 3.0% or lower *For more details, please refer to the PDF document or feel free to contact us.

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