Humidifier Spares-Agua 1.2ltr-Round evaporator pad To be changed every 6 weeks Price: £15.28 incVAT These evaporator pads soak up the water from the base of the unit and helps the evaporation process take place. Pack of 2 pads 340x310mm. To be used with the Agua Radiator Humidifier. IN STOCK NOW. FREE MAINLAND UK DELIVERY IN 2-3 WORKING DAYS.