Slow sand filter for water supply

Effective against cryptosporidiosis! Introducing high-quality filter sand rich in quartz.

"Slow sand filter sand" is the filtration sand used in slow sand filtration ponds. The slow sand filtration method is a historic filtration technique adopted when modern water supply systems began in London in the early 19th century, producing high-quality drinking water at a slow filtration rate of 4 to 5 meters per day. The effective diameter, which indicates the particle size, is specified to be between 0.30 and 0.45 mm, and the uniformity coefficient, which indicates the consistency of the particles, must be 2.0 or less according to the Japan Water Works Association standards. 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 less ■ Friction rate is 3.0% or less *For more details, please refer to the PDF document or feel free to contact us.

Filtration EquipmentOther water treatment equipment