Review on Filter Eheim Biopower 240 by Stanislaw Rogulski ᠌

Took for 4500r The filter as a whole is very good, its noiselessness is especially pleasing, the 80l aquarium (60 * 30 * 50cm) is in the bedroom 2 meters from the bed, believe me, the filter is silent. But he has some questions: 1. with a strong immersion, aeration stops working 2. the substrate is good, but how effective is it in such a small amount? It's better than nothing at all, but is it really effective? I would like one more sponge in the kit, so that I myself decide to make more sponges or more substrate 3. when rising from the water, all the muck from the sponge falls back into the water, I try to get the filter out carefully, but still some of the debris flies out, I didn’t have such a problem in the Eheim Pickup 200 model. But that's more of a quibble.