Marineland Penguin Bio-Wheel Replacement Power Filter Cartridges, for Aquarium Filtration

I have been running these my Marineland 350's (6) for quite awhile and they are still going strong and doing a good job. The cartridges are good and are reusable. I clean mine in tank water and drop them back in the filter housing. I use the refillable media cartridge in the second slot on each side for whatever chemicals if needed. http://www.amazon.com/gp/product/B0009YHSE8/ref=oh_aui_search_detailpage?ie=UTF8&psc=1

I work at a store full of pets and I always recommend these guys filters to my customers. I personally have them in both my 10 and 20 gallon tanks. I even tried another filter and while it might have been quieter, the filter didn't compare to how clean and clear the water looked with this filter. I also tend to go a filter bigger( 10 gal has 20 gal filter and 20 gal filter has 30 gal filter) so it just helps even more. The bio wheel is something that you NEVER want to touch. B/c that parts hard to find to replace and can get pricey. these products can be pricey but it is worth it in the long run. I don't overcrowd my fish and only change the filter media every 3 months. Every month I rinse off the stuff on the media and reuse. But overall its a great product def worth the money and their customer service was AWESOME and actually knew about the products they sold and what they didn't sell. So thats a big thing, it was hassle free for me when I bought the kit and filter was dead. They got my info and bam I was sent another one. But really great company, I won't be turning away from their products anytime soon!