Abstract: A training potty in combination with a potty liner. The liner has a multiple of accordion-type folds therein to accommodate differently sized potties. The liner has an upper collar to overlap an upper rim of the potty. The collar may be of a flat construction or may have accordion folds therein. The material of the liner is of the same quality is the toilet seat covers. The material is coated with polyvinyl alcohol to create a polymeric film having hydrolytic degradability additives that allow the soluble material to dissolve only when exposed to water. The biodegradable material, thus used, prevents any plumbing blockage.