Biological swimming pools vs. Conventional Pools

A person who has never seen a biological swimming pool (Piscina Biológica®)  does not even know exactly what it is. It may be useful to make a first approximation to the subject by comparing this with a conventional swimming pool.


Someone who owns a biological swimming pool (Piscina Biológica®) or who has bathed in one, this comparison may, on the contrary, it seem absurds – more or less the same as comparing apples and oranges…

While in a biological swimming pool  good water quality is achieved by taking advantage of all life forms in it, in a conventional pool, on the contrary, this is done by adding chemicals.

In the case of swimming pools that use chlorine, it has the disadvantage of dehydrate the skin, mucous membranes and eyes. People who spend a large number of hours a week in these swimming pools, such as swimmers, also suffer from tooth discoloration and the development of brown spots that result from the combination of chemicals used in the treatment of water with their own saliva.

Effective disinfection of a conventional swimming pool requires, in addition to the use of chlorine, other chemicals, namely algaecides, fungicides and flocculants, in addition to products intended for pH adjustment. As some of these products can not be applied simultaneously, the owner of a swimming pool of this type has to follow a schedule of application of different products, which can become quite demanding and annoying.


Another type of conventional swimming pools that has become popular in recent years are the pools that use as a treatment system, salt rather than chlorine. However, these pools use cooking salt (sodium chloride, NaCl) as a reagent to obtain the same chlorine as sodium hypochlorite (NaClO). This, in contact with water, releases the so-called hypochlorous acid (HClO) which is the active disinfecting agent. Hypochlorous acid molecules pass easily through the cell membrane of microorganisms and initiate the oxidation of their cellular components, destroying them. These are therefore very similar systems. In any case, in addition to the chemical treatments, the maintenance of a conventional swimming pool also requires the use of mechanical filters and the regular aspiration of the swimming pool.