Poly Bio Marine Poly Filter Pad 4x8 Subset_20x10 For the immediate biological activation

For the immediate biological activation of filter media

multiple dynamic effects and a programmable 24-hour light timer

They're seaweed

500 gallons

Poly Bio Marine Poly Filter Pad 4x8 Subset_20x10 For the immediate biological activationThe POLY FILTER is for filtering and purifying both fresh and salt water aquariums. It is a formulation of a special patented material bonded to a synthetic matrix. By means of a unique proprietary process, the POLY FILTER is made impervious to salt and is also organic loving to certain materials. It can absorb and adsorb contaminants and other toxic materials found in nature or added to fresh and salt water with or without fish and invertebrates.