New Product. Check all Pictures shown condition of the item that you will receive B53. Filter cotton is eco-friendly, soft, durable and will not deform for a long-term use Lightweight design with multiple thick holes is very suitable for using in fresh water and marine water Dense shape makes it effective to avoid residue, and the filter can be cut any sizes as you needed The filter can decompose the excrement and the forage leftover effectively, leaving the fish fresh water to breath Excellent water permeability makes it avoid blockages and provide the largest adhesion area for bacteria, cultivate the nitrifying bacteria for biological filtration
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