3 x DIY Course 20 PPI Foam Media Sheet for Pond and Aquarium Filters 12'' x 9''
Grade Of This Foam 20 ppi Course Foam. Grade Foam 10 ppi. Grade Foam 20 ppi. Grade Foam 30 ppi. Grade Foam 45 ppi. DIY Fine Foam Sheets. Provides Efficient Water Flow With Less Clogging For Long Lasting Filtration.