Review on Marineland Cartridge Refill Penguin Filter by Lee Reyna

When it comes to plastic, Marineland know what they're doing. They have clasps on both sides on the outside that keep the edges perfectly flush so not even a grain of charcoal can escape through the sides. The front and rear grills are the same size as the Rite size C. Inside there are compartments or tabs that facilitate even filling and then when connected together will not fall to the ground by gravity. Great if you need to treat fish as you can remove the char without breaking the foam. Connect to Blue Bonded by Aquatic Experts and you're on your way.