Direction for usage : *To be used in overhead tanks and sumb . * Add 500ml Aqua clean in 5000Liters of water and leave overninght *lingering smell of aqua clean prevents growth of harmful bacteria ,algae,fungas and germs . *minimum dosage : 1.two times in week. * Boiling aqua clean treated water recommended for drinking and cooking purposes.  Shipping charges are extra at actuals—Please contact 9962800901.