Many characteristics, chemical and microbiological, play a serious role in the good functioning of the pool. Our purpose here is not to make you an expert in chemistry, but to analyze some chemical terms as simply as possible, so that everyone can intervene and improve the quality of water in their pool! You may already know that the type of water is H2O. In the pool, however, we are more interested in the salts or microorganisms that are dissolved in the water and give us the various conditions.