Opened the pool this evening and it didn't go so well. When I tried backwashing the filter, the flow out was very low. I then switched it to "waste", same thing. Back to backwashing and finally got a good flow out. Moved it to filter and it didn't seem to be pulling much water. I am not sure what is going on here. After fooling around some more, I moved it back to backwash and then there was low flow again. Is this a pump problem, a filter problem? How can I troubleshoot it? The filter is older, with sand that is 4 - 5 seasons old. Pump is about 4 years old...
Thanks for any direction here!
25,000 gallon inground, vinyl lined pool, sand filter
5 year pool owner