Hi, I have a sand based filter, when I set it to backwash mode I only see dirt going through the wire glass when I open the waste tube, is this normal?
Hi, I have a sand based filter, when I set it to backwash mode I only see dirt going through the wire glass when I open the waste tube, is this normal?
Normally, when the filter is set to backwash, all water (& debris) flow is directed out the waste port of the multi-port valve. If that waste port is blocked by a closed valve or cap, then there will be no flow, and you will not see any movement in the sight glass.
This will also create a pressure build up inside the filter, and that is not recommended. Be sure that the waste port is unobstructed before running the filter in 'backwash' or 'waste'.
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