I recommend buying additional blocks of soap. Very good quality! for those who are especially economical, after the end of the block, you can drill holes and pour ordinary soap with a ratio of water three soap one  but I don’t recommend doing this very often ordinary liquid soap diluted with water freezes and the device stops working  Has some pros: Makes foam  very pleasant and gentle to the touch the soap that comes with the kit is very well washed off with water there is no feeling of soapy hands very convenient to use if you have to wash your hands very often during the day  Cons below: Batteries last about a month if you often wash it is decided to replace it with rechargeable batteries 
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