Firstly, although both types of water purifiers can purify water impurities, their purification principles are not the same. The RO reverse osmosis water purifier is equipped with an RO reverse osmosis membrane inside. Under the action of pressure, water can pass through the RO membrane, while impurities such as inorganic salts, heavy metal ions, bacteria, and viruses are blocked by the reverse osmosis membrane.

Ultrafiltration water purifiers purify the water source through their internal ultrafiltration membrane. Under the push of pressure difference, the water source can pass through this layer of membrane and filter out impurities.

The two types of water purifiers, which use different purification methods, have certain differences in purification precision according to their principles. The RO reverse osmosis water purifier has an RO membrane inside, and the pores of this membrane are as small as the nanometer level. Even tiny viruses and bacteria are thousands of times larger than the pores of the RO membrane. Therefore, the water that passes through the RO membrane basically only contains water and no other elements, and the filtered water can be drunk directly or boiled.

The ultrafiltration water purifier has an ultrafiltration membrane inside, and the pore size precision range of this filtering membrane is 0.01~0.001μm, which is one order of magnitude larger than that of the RO reverse osmosis water purifier. At the same time, the ultrafiltration membrane not only allows water to pass through but also allows some small molecular substances with smaller volumes to pass through, such as some mineral elements.