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Reptology Internal Filter 175 Replacement Bio Sponge helps keep your terrarium water clean. The sponge removes ammonia and nitrites from you terrarium water keeping it healthy. This bio sponge also optimizes the colonization of beneficial aerobic bacteria which prevents cloudy water and excess CO2 which can be harmful. Made specifically to fit the Reptology Internal Filter 175; this replacement bio sponge fits securely without gaps that lead to weaknesses in filtration strength. An exact fit keeps debris and contaminants from getting through your filtration system and back into water.