Maximizing Filtration Performance with Dennerle Filter Element: The Ultimate Aquatic Solution Review

I bought these for my two Dennerele filters. You only need to change it once every 3 months. I rinse mine with the water I take out of the tanks during water changes so I don't wash out all the bacteria and reuse them so you can actually last a little longer before changing.

Works great with a Dennerle filter (the Dennerle filter is VERY quiet, by the way). Running this in ONE day dropped my TDS from 575 to 240. However, I wish there was chemical filtration or just a filter cloth that you could replace - they come with separate plastic structures. In addition, the price is quite high. But then again, if you need to lower the TDS for shrimp, great!

I like this filter and these refills are good. But I won't buy it again because it's too expensive. I kept the frame from the replacement unit and simply cut a piece of filter cloth that I bought in bulk and inserted into the frame. This filter does not contain activated carbon. I also replaced the sponge on the bottom with a carbon sponge. This German filter is worth the money. You don't hear anything and you can control the flow of water. The slow flow setting is ideal for betta fish.