Water
Water. Under this complicated heading in the menu at the left, the first eight pages all concern basic things you need to know about water, conditioning it and testing it.
The last three sub-headings in this "Water" section are more complicated. They cover all the kinds of solutes that distinguish natural and aquarium water from pure distilled H2O. The dissolved gases and dissolved minerals— and the dissolved organic molecules to a lesser extent— have various effects on four measurable properties of water: pH, buffering capacity, general hardness, and salinity.
Not everything in water is dissolved; you may be concerned with particulates, which need to be removed by mechanical filtration: the "Filtration" section is what you want. Or you may be concerned with cloudiness,which is either a plankton bloom or algal green water. Softening water is so important it gets its own page in the "Filtration" section.
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