
I use this gasket to keep nitrite/nitrate levels down in my 75 gallon reverse osmosis water tanks. All I can do before using this pad is apply heavy water pressure to it and let it sit down the sink for a few minutes before placing it in your filtration systems. This will remove loose or residual particles. However, it is NOT harmful to freshwater fish when large amounts of loose particles are present. YOU don't want it to be fish food or they may get sick. I have big and giant Silver Dollars ball sharks and they are happier with this blanket in my arsenal than they were before I got them. GOOD LUCK and have a nice aquarium time everyone.

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