How to decide on the choice of a good mixer.
Standard mixers have in their design gaskets of rubber, paronite or silicone.
Under the influence of water, such gaskets quickly become unusable and they have to be changed. More durable ceramic gaskets, but they quickly deteriorate from the effects of ordinary tap water, and to extend their service life on the water, you have to put a water purification filter.
When choosing a ball mixer, pay attention to the size of the cavity for mixing water, the amount and size of the inputs and outputs for water. The larger the cavity for mixing water, the larger the inputs and outputs, the more stable the mixer to the effects of tap water and lasts longer.