I had a Eheim for over five years. It finally started to have problems. So I decided to get a new filter. I decided on a Fluval as the store did not carry the Eheim. I bought it and after a couple of weeks of working it could not keep up to what the Eheim did. So ended up getting back online to buy another Eheim. So glad I did. Hands down the Eheim is a far superior product.
I own one before and they work the same way. I like use them. Much better than the classic ones. Professional is easier to clean.
However, it come with a broken box and some dust. So I’m not sure if is second hand item or not.
Since it works perfectly, I’m not going to exchange it.
I can't say enough about these filters. The engineering, design, fabrication and workmanship can't be topped. I've owned a lot of filters and these are the best.