ZEO-WONDER 408 contains smaller chips 1/16-1/8" size chips for smaller filters that use less media and does not restrict flow. Zeolite which is a natural mineral absorbs deadly ammonia in freshwater systems. ZEO-WONDER is included with all Unimax Filter systems and is an economical filter media that can be used with any freshwater filter system for aquariums, goldfish bowls and ponds. Zeo-Wonder can be recharged with saltwater but also works well as a general filter medium in freshwater aquariums. Packed in a convenient see-through bucket with carrying handle. Available in 3000ML (approx 76oz).