Polyaluminum chloride (PAC) can be used to treat algae in water:
Algae removal
PAC can be used to remove cyanobacteria and phosphorus from fresh water.
Chemical algicide
PAC can be combined with copper sulfate to create a chemical algicide for ground surface eutrophic water algae.
Coagulant
PAC can be used as a coagulant to remove algae and other organic matter from water.
Water treatment
PAC has been used to treat water in Danish lakes and the Swedish lake Brunnsviken.
However, the toxicity of PAC can vary depending on the type of water and the conductivity of the water. Before using PAC to treat water, it's important to test it on non-target species, such as invertebrates, to understand how it will affect the ecosystem.
Aluminum chloride can also be hazardous:
It can ignite combustibles like wood, paper, and oil.
It can react violently with water and moist air to create toxic hydrogen chlor
ide gas and heat.
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