Water Problems

and solutions to them

Polluted water

Polluted water is one of the biggest reasons that people get water related viruses/diseases because people don't realise that the water they are drinking may be untreated sewage water. Drinking untreated water causes diseases such as Adenovirus infection, Amebiasis and Campylbacteriosis, with some side effects including stomach pains Diarrhea and stomach cramping.

Scientific Solution

Algaecides

Algaecides are chemicals that kill algae and blue or green algae, when they are added to water. Examples are copper sulphate, iron salts, rosin amine salts and benzalkonium chloride. Algaecides are effective against algae, but are not very usable for algal blooms for environmental reasons.
The problem with most algaecides is that they kill all present algae, but they do not remove the toxins that are released by the algae prior to death.

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Upsides

It gets rid of the algae and bacteria in the pond/lake/water source/water storage tank.

Downsides

A downside to using algaecides is that it is not permanent. Also if you have small sensitive plants nearby then it may also have an effect on them and kill shrimps they often contain copper, which can be quite toxic to inverts and even many of the plants we try to keep up.

Environment

As I mentioned in the downsides section this chemical kills shrimp and some inverts which may effect the food chain a little bit.