13 FILTER INSTALLATION AND USER GUIDE BARRIE • ONTARIO • CANADA 705.733.8900 WWW.EXCALIBURWATER.COM 3) CONTROL VALVE Control Valve Cycles SERVICE BACKWASH Service Operation: - This is the normal running cycle when inlet water flows downwards and get filtered after passing through the capsulated air and Zentec Media. Backwash Cycle: - In this cycle water flows in reverse (upward) direction to the drain line which expands the media. The backward flowing water washes away the collected iron and other metals.
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