Active Sand Is Black And It Is Recommended To Filter The Water Of The Well Bore And The Like. Contact: CV 081234590404 independent business Partners. Very active sand Discharging time depends on the condition of the water, the lower the quality of AirBaku Then the faster time of the substitution. However, in General Usage Period Is 1 year. Packaging: Zak Weight: 25 Kg Hub: WATER PARTNERS CV, JL. Keputran small market 2/17 Surabaya phone: 031-5452872 Fax: 031-5355728, Hp: 081234590404, 03181118112