【Protect shrimp and fish】 The filter cotton is filtered in multiple layers, which completely prevents shrimp and fish from being sucked in. 【Prevents clogging】 It can prevent large foreign objects from being sucked into the filter system and becoming clogged. 【Used】 Suitable for aquariums, protecting shrimp and small fish and purifying water quality. p> 【High quality】 Our aquarium filter cotton is made of high-quality sponge with good filtering effect 【Increase the oxygen content of the aquarium】 The principle of biological filtration uses multi-layer filtration to cultivate high-density nitrifying bacteria to achieve the effect of increasing the oxygen content of clean water