Rinnai used to flush the unit. After seeing what plumbing was like, I felt comfortable doing it myself. The cost of the device is definitely less than hiring a plumber. The bucket is too small. It is best to use a five liter bucket. The instructions were good and there are plenty of videos online to walk you through the process. This allows me to wash the sink at least twice a year. Use only one pump to prevent the seals from drying out.
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