This is the Bosch Descaler Dishwasher/Washing Machine 250 g 
Quick acting descaler for dishwashers and washing machines ...Contact us if you need more help.
Genuine original replacement spare part
Ideal in hard water areas
Suitable for both washing machines and dishwashers
Regular application can extend the life of the appliance
In hard water areas, washing machines should be descaled every six months and dishwashers once a year