I ordered the coal to renew the active filter in the hood itself. She is super suitable. Has worked very well and is a lot cheaper than buying new filters. In addition I have cut out the grid of the round filters with a cutter and the old coal removed. After the new coal was introduced, there was a mosquito net made of plastic (there are at the hardware store by the role) above. The whole fastened with long cable ties and finished was the new filter. So both filter costs about 5! There is still a lot of coal for more refills left.
