Very good, I put two of the same natural ones in a 600-liter aquarium with six large water turtles. It really does what the company promises. In short, I am completely satisfied and highly recommend it.

Do not bother buying more expensive filters that ultimately do not work at all and have a reduced flow. This filter does its job perfectly, I have had it for 5 years and it has tremendous power

Very accurate!!
It makes a little noise, like other similar ones...
It is powerful, does the job, and cleans very easily.

After about 6 months of use in 60 liters, we have to say that it does its job. I have achieved a crystal clear aquarium many times. The sponge holds a lot of dirt (to the point where it shrinks). However, mine seems to have a defect and occasionally you hear the propeller playing. In this case, I put in and take out the plug as many times as necessary until it starts without making any noise.

One downside is that it only takes water from the bottom, so in an aquarium with "mud" and plants, it gets clogged very quickly.

If I were to buy again, I would definitely choose a slightly more expensive one with better build quality