ECOWASH is available in two versions: with polyphosphate and with cartridge.

With polyphosphate: anti-limescale action. It is used against the formation of limestone, in order to protect domestic systems and appliances, such as washing machines and dishwashers. Each filter can contain 100g of polyphosphate crystal inside. This model has a blue head.
With cartdige: mechanical filtration. It removes sand and other small particles in the water. It is used for washing machines, dishwashers, steam cleaners and gardening appliances. This model has a green head.