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What about Walker's water purifier?

Not so good.

1, with a wide working place. If it's just installation, Walker's water purification installation has to go to many places every day, which is a manual job, and then the number of water purifiers installed is linked to the performance.

2. The workload is heavy in the later period. When there is a problem with the water purifier installed for customers, it takes a lot of time to go to the door for maintenance, and the workload of later maintenance is heavy.