Flowrate of my XP3 has dropped significantly

by Darren
(Darlington, England)

Hi, ive had a Rena XP3 for 2 years now, and it has been superb. Recently, however the flowrate has dropped significantly. Ive taken the filter out cleaned it all up, making sure theres nothing on the impeller, hoses etc etc. When i first put it on, the flowrate is OK, but after a short while, it slows down again.
Can you suggest what maybe causing this?
Thanks for your help Darren

A: Please read through the other Q&A's already posted and if you don't find anything that helps you you might try contacting the manufacturer, Mars Fishcare, directly.