How much does it cost to replace supplies for a water purifier every year?

Home water purifier replacement supplies currently priced genuine at about 260 yuan, the general in about 140, including labor costs. Replacement time as required is 3 - 6 months, the Northwest is generally half a year to replace the first level, 12 months to replace the first three, 24 months to replace the rear carbon. Activated carbon replacement generally do not exceed 12 months.