-Product Name: Reddish brown lava stone SETUP burlap filter aquarium | Super BEAUTIFUL STONE MOUNTAIN DESIGN - Factory: Phuoc Lai Fine Arts Co., Ltd ☀☀ Lava Stone ☀☀ 1 product = 1 bag = 1kg Brown STONE is a filter material that filters water. _ Place the brown lava behind the filter's cotton compartment, suitable for overflow filter, bottom overflow filter, barrel filter _ You can use an aquarium base, use a base, but should not be used too much, it will be able to dissolve heavy metals in water. _ Feature: Derived from natural volcanic rock High permeability creates the ideal environment for the growth of bacteria Convert harmful chemicals created by waste from aquarium fish into harmless factors.