Well About 10 years ago . I bought a eheim 2228 with a 72 gallon bow front. I think i paid $ 450 for the filter and tank. I had it for a few years and then i got bored of fish and gave the tank and filter to my brother He has been running it for the past 5 or more years until last week. Well I pick it up and was surprise to see it had the same filter media from the first day i got it gave it a good cleaning and it running better than almost as good as a few new eheims I have . So for those who wonder why eheims are so expensive they are made to last.