Pure water is H2O with nao other minerals or chemical.
There are various types of water.
Dirt, sodium, fluoride, iron, copper, silicon, nitrates, lots of chlorine, viruses, bacteria, chemicals, up to 500 parts per million contamination.
Same as above problems with up to 400 ppm contamination.
Also contains contaminants plus picks up the mineral or organic matter as it passes through soil and rock, usually over 500 ppm contamination.
Inorganic minerals remain with dead germs.
Picks up bacteria, dust, smoke, mud and minerals & acid rain.
Bacteria and viruses remain, filter collects decaying matter. After a few days the bacteria multiplies through the filter, causing greater contamination.
Nothing to report!