Pilot data and data-bearer data are formed to be mutually orthogonal and in each other’s null-space. Specifically, acrylic-silicone hybrids having a tensile strength of approximately 100 psi to 400 psi and a percent elongation at break of between 50% and 400% are disclosed. The frictional engagement is determined so as to prevent longitudinal sliding movement of the drawer slide rail with respect to the frame slide rail when a force less than a predetermined force is applied to the drawer in any position of the drawer with respect to the frame over the entire range of longitudinal sliding movement of the drawer slide rail with respect to the frame slide rail. A partition plate is disposed between the first and second chambers such that, when the filter is hung on the aquarium, the extraction pump guide tube pumps the dirty water into the first chamber.