Aquarium Diatomaceous Earth Filter Powder - Food Grade (3.3 LB / 1500G)
Recommended Dosage:  Add 1-3 cups of SR Diatom Filter Powder to your filter depending on manufacturer suggested instructions.(Vortex Diatom is a registered trademark of Vortex Innerspace Products, Inc.Marineland 350 Magnum is a registered trademark of the United Pet Group, a global manufacturer of premium pet products, a division of Spectrum Brands Holdings, Inc.)