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  1. How does alum work as a coagulant?
    • The particles in water have slight negative charges, which causes them to repel each other and not form larger particles. When AlSO4 is added to water it forms an AL(OH)3 precipitate, which has a slight positive charge. The AL(OH)3 collides with the negatively charged particles in the water and neutralizes the charge.
  2. Is aluminum sulfate harmful to humans? Animals?
    • Any chemical can be harmful to humans and animals in the incorrect dose.
  3. Is there aluminum sulfate in the water leaving the demo plant / other AguaClara plants?
    • Answer needed.
  4. Does treatment with aluminum sulfate do anything about microbes or other disease carrying agents?
    • No, treatment with aluminum sulfate does not kill any microorganisms. It only binds to them together. Chlorine is used to disinfect the water, similar to plants in the United States.

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  1. How do AguaClara plants remove disease carrying agents from the water supply
    • AguaClara plants remove sediment from water through a process known as flocculation and sedimentation, and use chlorine to disinfect the water. Disease carrying agents are killed with the chlorine.
  2. Aside from clay, what other things do AguaClara's water treatment plants remove from the water?
    • AguaClara technology removes any suspended particles from the water. These particles can include clay, organic material, bacteria and parasites.
  3. How do AguaClara plants remove disease carrying agents from the water supply?
    • Answer needed.
  4. How long is the chlorine in contact with the water until people drink it?
    • Answer needed.
  5. What is turbidity?
    • Turbidity is a measure of the cloudiness of water due to suspended solids. A nephelometric turbidimeter measures the turbidity by passing light through a sample of water. The scattering of light caused by lots of particles contributes to a higher turbidity or nephelometric turbidity unit (NTU) reading.
  6. How turbid can the water be entering the plant, for it still to be clean when it leaves?
    • Our experience with the plant in Marcala, Honduras treats water with an incoming turbidity of up to 600 NTU.