Tunai Bio Balls for Aquarium Filters are specifically designed to have a huge surface area to grow massive amounts of good bacteria. The beneficial bacteria colonizing each bio ball will make a dramatic difference in water quality by removing harmful ammonia and nitrites. Aquatic Experts bio balls will provide an incredible source of biological filtration such as 1) Each Bio Ball is nearly 2 square feet of surface area for good bacteria to grow, 2) Distinct shape allows our bio balls to pack lightly into any shape filter, 3) Perfect for trickle filters to increase oxygen levels, 4) Lightweight but tough enough to keep their shape and not break down and 5) Safe and reliable bio filter media for fresh and saltwater. Maximum Surface Area: Tunai Bio Balls provide a massive amount of surface area in a pond or aquarium so lots of advantageous bacteria can form on the surface. These good bacteria can help to convert and remove harmful waste & helps to keep the marine creatures safe. Unique Design: Bio balls filter media are meticulously crafted from high-density plastic so they keep their shape and will never degrade & will function equally well year after year. The unique spherical shape and spine placement allow them to be tightly packed in any shape. Quality Construction: Tunai Bio balls are made of high-quality polypropylene, which makes them a secure & reliable biofilter media for fresh and saltwater. They are manufactured for use in koi and water garden ponds, freshwater fish tanks, saltwater aquariums, aquaponics, fish hatcheries, and much more.