***Please note® this listing is for the Golf Filter Case Only® Filter Material not included *** The 1/4" filter is for use with 12.4 gallon solid reservoir. It is simply inserted inside the tank once the 1/4" pipe is pushed through the 1/4" Top Hat Grommet at the bottom of the tank. It can be easily serviced and will float to the top if it comes detached from the tube, this will not happen if you make sure you have pushed the filter firmly into the tube.