Blue Vet Phosphate Control Size:1 oz and the transparent flap is

and the transparent flap is preferred by most pets

Directions: For use with Cat Flap models: 234W

30 PPI (Pores Per Inch) pads provide finer filtration for removal of smaller debris

Luxurious nylon collar with reflective safety stitching

Resealable pouch

Blue Vet Phosphate Control Size:1 oz and the transparent flap isBlue Life Phosphate Control is an amazingly simple and effective product that has revolutionized the way phosphates are removed from saltwater and freshwater aquariums. Reef safe Quick and effective Works in fresh and saltwater Veterinarian approved Having a phosphate free aquarium will control the growth of hair algae and other nuisance algae. In addition, regular use of Phosphate Control will increase the vitality, color and growth of your aquariums