SOURCE: I have a P20 Pantera
The last time I saw this there was a valve problem on the controller and the filter sand needed changed. If that sand has been in there more than 12 months and running most likely the sand needs replaced. While you have it open you can check the pipes and fittings in the Filter Unit to make sure something didn't come loose. If I remember correctly it recommends changing the sand every 2 to 3 years unless there is a lot of build up which you described indicating the need to change it. The 2 to 3 year recommendations comes not so much because of the sand but to inspect the inside of the filter unit as well.
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