As part of a good value package, I was provided with an Aquamanta EFX300 by MA. I found that there is considerable media bypass, even after thoroughly checking that assemby was correct. Consequently, the water was not perfectly clear, and tiny snails could bypass the media, causing blockage of the spray bar holes. Also, the end stop on the spray bar kept popping off as the holes became blocked, and on one occasion it disappeared into the heavily planted aquarium. I went on to MA website for spares. They have spares pages for many different items, but NOT for the Aquamanta range - exclusive to themselves. I used their 'contact us' box three times requesting this tiny part be sent urgently. I was totally ignored. So I purchased an Eheim Professional 3 filter. The water is now 'gin clear' and the spray bar does not get blocked, and you can get spares from numerous sources.