1st stage: PP Sediment Filter
removes dirt,sand,rust and other sediment of water
best for 3 ~6 months water filtration
2nd stage: UDF Carbon
removes unwanted odor or smell of water
improves water taste
best for 6 ~9 months water filtration
3rd stage: CTO Carbon
removes chlorine and some heavy metals
improves water taste
best for 6 ~9 months water filtration