But, nevertheless, septic tanks have a shortage: the degree of purification is less than that of aeration systems, and therefore it is prohibited to discard the liquid from the septic tank to the reservoirs. It should undergo soil cleaning. For owners of residential buildings, this drawback does not mean anything, because in their sections the septic tanks will be installed in such a way that soil cleaning will occur by itself, because the septic tank will be installed underground. Also, in favor of septic tanks, the price also tends. On them it is much less than for complex aeration structures.
