PERFECT NEW Maifan Stone Maifanite Aquarium Fish Tank Filter Media Material Release Mineral Purify Water Balance PH PERFECT NEW Maifan Stone Maifanite Aquarium Fish Tank Filter Media Material Release Mineral Purify Water Balance PH High quality aquarium filter media, inner zipper filter mesh bags in the outer box, using the best materials available in the market. Just drop them into your canister or power filter to provide minerals that stabilize water quality while their highly porous shape filters and cleans the water Mesh Bag included Usable in Fresh or Salt Water Effectively purify aquarium / dechlorinate and disinfect / remove odor and smell / balance PH Absorb and remove waste, release minerals Weight: 1000g