Aquarium Care · Aquarium Filters · Filter Foam · Koi Pond Care ·Oct 02, 2026 Cut-to-Fit Aquarium Filter Foam: Choosing 15, 25, 35 or 50 PPI Compare 15, 25, 35 and 50 PPI filter foam, learn what to measure, and choose cut-to-fit media for your aquarium or koi pond filter. Continue reading
