Boyd Chemi-Pure Grande (40 oz) – An extra-large filtration media pack containing Boyd’s renowned Chemi-Pure for maintaining crystal-clear, healthy aquarium water. This 40-ounce jar is filled with a proprietary blend of high-grade activated carbon and ion-exchange resins that work together to remove dissolved organics, toxins, odors, and discoloration from water. Designed for big aquariums or ponds, Chemi-Pure Grande helps stabilize pH and creates an optimal environment for fish and corals by polishing the water to sparkling clarity. Long-lasting and easy to use (just place the filter bag in your filter or sump), it’s a convenient all-in-one chemical filtration solution trusted by aquarists to keep aquatic life thriving.