A - three dimensional hole formed into a large surface area, where the holes wall and the air are connected smoothly, which is conductive to the attachment and reproduction of beneficial bacteria. B - Quickly establish a well develop nitrogen cycle in the aquarium within 1 week. C - Combination of several 4D mass bio-media which provide the function: balance the water quality, regulates the water pH, releases a variety of trace elements to activates the water quality, keep fish strong & healthy, absorbs harmful substances to resist the germs growth and releases far-infrared to increase the active of beneficial bacteria for water healthy. D - Resistance for rubbing and washing, can long last for 10 years. E - Within a short period, 30 seconds, the filter material is conducive for the absorption and colonisation of beneficial bacteria. F. Made with polymer bionic foam exfoliation technology where large particles of impurities are blocked, and the ammonia and nitrite carried by water molecules pass through the filter material and are decomposed by beneficial bacteria.