I have a Pentair Whisperflo pump that is 3 months old. I clean the strainer basket in the pump and pool baskets religiously but once per week I am having to remove the back of the pump to expose the impeller and remove a baseball sized hair ball. I can always hear a noticeable difference when the clog is there such as a louder pump and my flow has decreased. Is this the norm for these pumps? Is there some precaution that I can take to lessen this?