Feature: Cotton filter for fish tank, double-layer designed, is dense and fine for water purification. Can quickly adsorb ammonia, nitrite, nitrate, phosphate. Energy medium to strengthen nitrification, stable ecology can be rapidly established. Can be long-term stored in a dry place! Specification: 1Material: Biochemical cotton Color: light green Product weight: about 52 g Product size: About 120 * 30 cm Package Includes 1x Filter Biochemical CottonFeature: Cotton filter for fish tank, double-layer designed, is dense and fine for water purification. Can quickly adsorb ammonia, nitrite, nitrate, phosphate. Energy medium to strengthen nitrification, stable ecology can be rapidly established. Can be long-term stored in a dry place! Specification: 1Material: Biochemical cotton Color: light green Product weight: about 52 g Product size: About 120 * 30 cm Package Includes 1x Filter Biochemical Cotton |