Yes. People use tap water in their fish aquariums and it is filled with chlorine (and worse) . They sell Chemicals to balance the chlorine level.
They need to find a way to reduce the toxic algae blooms that are killing fish all over the planet.
Blue-green algal blooms can be caused by agricultural and stormwater runoff as well as leaching from septic systems. In Ontario, phosphorus tends to be the nutrient that influences the growth of algae.
I'm not so sure these algae do kill fish A bit like saying the disease is what kills us when the disease is the body trying to restore balance and rid of toxins. As above so below. What they do is akin to dosing us with antibiotics to kill the things that are doing the clean up job. Man fighting nature is ridiculous. The cause of the bloom is as you said pollution caused by man.
Yes … I agree 109% …. We need to stop putting chemicals into the air and water.