What is the difference between filter 1.0 and filter 2.0? Fiter2.0 improved raw materials and added raw materials in accordance with We use the premium raw materials from the British premium company and Double the amount of filter material.< /li> With a four-layer filtration system: high-quality filter cotton, coconut shell activated carbon, carbon dioxide exchange resin ions, can block pet hair, debris, heavy metals and other impurities more effectively, making the water more suitable for pets. Yes, pay attention: FILTER 2.0 for PETKIT Fontaine 1.0 and 2.0 But when it is used in PETKIT Fontaine1.0, you also need to buy a matching tray. How can the filter be used? 2.0 filter for the 1.0 water cooler? How can filter 2.0 be used for water cooler 2.0?