This is not a water filter. When people are sicked with too many flies, they started to be creative. This is how they catch flies at site. It is designed such a way that the flies able to get into the container but unable to get out. The theory is simple, flies eagerly enter from the small holes at the side. On the other hand, flies always thinking to escape vertically (smart flies!!!). Therefore, the plastic bag is installed to avoid the flies from escape. Smelly food is normally put inside the container to attract the flies. Once the plastic is full with flies, remove it and throw it away. Simple as that!!!
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