There are a few different ways of doing this. With the Penguin filters, you can purchase a media container separately that fits into it. Here is a link to it on Pet Solutions: https://www.petsolutions.com/C/Aquarium-Filter-Cartridges/I/Marineland-Penguin-Filter-Cartridges.aspx?catargetid=520009670000581070&cadevice=c&gclid=CjwKEAiAlZDFBRCKncm67qihiHwSJABtoNIgqO5d4ouH2shsgCTUV00P_Pnf2l5JbHmjXnz53FHRMxoCUGfw_wcB. This would be the easiest method, just fill it, and slide it into the front slot of the filter system.
Another option is to take the toe of a nylon stocking and pour it in there, then tie it off, and place it in the filter box. Use approximately one ounce or 1/4 cup.
Date published: 2017-02-15