Feature: 1. PREMIUM MATERIAL: Aquarium filtration resin selects premium macroporous adsorbent resin material, which purifies water thoroughly and quickly. Extend the time of water change, easy to keep fish. 2. SUPPRESSING ALGAL OUTBREAKS: Fish tank filter resin reduces green water, protein cotton will absorb excess nutrients in the fish tank, can inhibit algae outbreak, and can remove fishy odor quickly. 3. WATER PURIFICATION: Aquarium filter resin adsorbs harmful substances, removes odor and yellow water, treats ammonia and nitrite in the water, and prevents fish from getting sick and dying due to such problems. 4. TIPS: Before using fish tank filtration resin, put the protein cotton into a mesh bag, rinse it with water, and place it in the filter tank or filter bucket drip box where the water flows directly to it. 5. CLEANING METHOD: Fish tank filter media is easy to clean, when the protein cotton is saturated with adsorption, soak it in salt water for 8 hours or less and rinse with water for 2‑3 minutes after soaking. Specification: Item Type: Aquarium Filtration Resin Material: Resin, Mesh Bag Use: Water Purification Aquarium Filter Resin Cleaning Method: Protein Cotton Adsorption Saturation, Soaked in Salt Water within 8 Hours of Sewage (300g/10.6oz of Edible Salt Per Kilogram of Protein Cotton) Soaked in Good Water Rinse 2-3 Minutes Package List: 1 Box x Aquarium Filtration Resin Note: 1. Please do not let the internal material float into the tank to avoid accidental ingestion by fish. 2. Please place it out of the of children to avoid accidental ingestion.