2 x DIY Course 20 PPI Foam Media Sheet for Aquarium and Pond Filters 18'' x 12''
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 Course Foam Sheets. Provides Efficient Water Flow With Less Clogging For Long Lasting Filtration.