Feature●Selected high?quality filter cotton + activated carbon materials, safe and durable to use.●Fish filter cotton replacement, easy to install and remove, providing water for fish .●Captures , fish , absorption of heavy metals, odors and decolorization, etc.●To get the best results, please replace the filter element as needed every 2 to 4 weeks.●Simply rinse with cold water to remove toner and insert it into filter slot, which can be replaced in a few seconds.Description