Can you put a filter cotton on the outlet of the fish toilet?

Of course. According to official website of Xianglong Fish Farm, placing a filter cotton at the outlet of the filter can effectively filter impurities in the water and keep the water clear. Fish tank toilet is a newly invented patented product. The flushing tank of the fish toilet consists of three water tanks. There is a fish tank in front with ornamental fish and aquatic plants in it, and there are two water tanks in the back, namely the water inlet and the water outlet.