Water cap in the back. Suiysuim countertop RO system's Self-Flushing is an automatic process of washing the RO water filtration, including the pure storage tank, PCC+RO filters and internal pipes. The process is done with purified water and there are two kinds of self-flushing: the System Startup and Daily Maintenance.It's easy to operate the self-flushing process. For the System Startup, please go as follows. Clean and fill the raw water tank to the MAX line. Plug and wait for 30mins.
Process is complete when To Flush button stops flashing and goes out. For Daily Maintenance, please go as follows.Water level in the raw water tank is at MIN line for auto-flush and empty for manual-flush. If Lack Water Alerts or process stops during flush period, lift the raw water tank slightly and reposition it firmly, filling the raw water tank to approach the middle level, then process will continue automatically.