We have an in ground pool with a sand filter and we have the following issues:
We can only vacuum with the "waste" mode. We are not able to vacuum if we use the "filter" mode.
The skimmer is not working. There is no flow of water to the pump/filter.
The skimmer basket and the pump basket are clean. It works if the filter is in "waste"mode and "backwash" mode but not in the normal "filter" mode.
There seem no clogs on the skimmer - pump line (but we are not sure).
WIth time the pool return jets have lost pressure.
We have not been able to detect air leaks.
What advice can you give us?