My grandma has a rena XP2 that she said is not pumping like it use to. She has cleaned the filter, impeller and made sure the hose's were not clogged. However, she is still saying it is pumping slower than is use to. This pump is ~6 months old. Many years ago I had a similar problem with my xp3 but never tried to figure it out... I just went to saltwater :-)

Any suggestions on what I can tell her to try?