A circuit substrate includes a base layer, a first patterned conductive layer, a dielectric layer, a conductive block and a second patterned conductive layer. The electrodes may be positioned within lumens of the catheter and aligned with apertures in the outer wall of the catheter. An electrically conductive metal may be deposited on the substrate to fill the holes and define an overburden on the substrate. Upon consumption by the animal, the psyllium husks take up water from the moist environment of the animal’s gastrointestinal tract and form a gelatinous bolus that sweeps through the gastrointestinal tract of the animal, clearing the gastrointestinal tract of intestinal detritus, such as sand, toxins, and microorganisms, which agglomerate with andor are carried away by the psyllium husk gel. A further benefit of the method according to the invention is that it may be executed after automatic generation, i.