well Anton van Leeuwenhock made a microscope and was observing water when he saw bacteria.
Break point chlorination refers to the continuous addition of chlorine to the water until the chlorine enquiry is met and all present ammonia is oxidized. Once the break point is reached, only free chlorine remains.
A qualitative observation merely indicates that the subject possesses a certain quality, for example "this water is salty". A quantitative observation takes a measurement of the quality, for example "this salty water has a concentration of 10% salt".
A fact can be either a general observation (water boils at 100o Celsius under normal atmospheric pressure) or a specific observation (this glass contains 100 milliliters of water). A law of nature is some illuminating general observation that helps us to understand how the universe works. The classic example of this is Newton's Law of Universal Gravitation - which remains very useful, even though it has been subject to revision by Einstein.
If you let your tap water sit for a couple of hours, exposed to the air, the chlorination will evaporate, and you will have something equivalent to rainwater.
inference
This is a prehistoric observation.
Slaked lime is added to water after chlorination as a coagulant to destabilize the electrostatic charges of suspended particles in the water.
Chlorination is the process of adding chlorine to water to disinfect and kill harmful microorganisms like bacteria and viruses. It helps make water safe for drinking and reduces the risk of waterborne diseases.
Fresh water with little to no chlorination.
To keep the water clean and kill germs
Chlorination
Chlorination is commonly used in water treatment to kill bacteria. Chlorine is added to the water to disinfect and kill harmful microorganisms, making the water safe for consumption.
filtration was introduced in the 1870s and chlorination in 1908
Chlorination.
Chlorination of water is effective against a wide range of bacteria, viruses, and parasites that can cause waterborne diseases. It helps to disinfect the water and make it safe for consumption by killing harmful microorganisms. It is a commonly used method to ensure the quality and safety of drinking water.
First thing to understand is it will NOT be clear for a 2-3 days after chlorination. This is normal - then after about a week, you test it with a pool clarity and Ph kit.
Scientific observation, is to see the action of a thing, and to see the effect of that action. Without action, you can not see. Without difference, you can not distinguish. Without experimentation, you can not physically divide. Those that have more knowledge, see more. But to see it more clearly: scientific observation is to view the movements, and effects of those movements, or to view any situation, and the effect of it. Example: I saw a fish swim though the water. So based on what I observed, I ask questions, like, how did the fish swim though the water. So I sum up everything I know, and I make the deduction; the fish must have separated the water in order to pass though it. So there it is; my first non-experimental scientific observation of the fish swimming though the water. Now to break it down from the top. I see the fish moving though the water, and I see the effect it has on the water.