All types of nano air stone, before use, the air inlet at the upper part, 45° into the water soaked for 24 hours, will get the best exhaust effect. All types of nano air stone, before use, the air inlet at the upper part, 45° into the water soaked for 24 hours, will get the best exhaust effect. It is not damaged. This is because it has not been cleaned for a long time or the water in the aquarium has not been changed for too long, resulting in the growth of algae in the airstone. Clean with 84 disinfectant , dry thoroughly, can be used again. You can't see algae growing in normal air stone because of its color, which means the water needs to be replaced. 6Inch 6Inch 10Inch 10Inch 12Inch 12Inch Materials Nanoscale material Nanoscale material Nanoscale material Nanoscale material Nanoscale material Nanoscale material 4In Nano Air Stone 8In Nano Air Stone 12In Nano Air Stone 16InNano Air Stone 24In Nano Air Stone Nano Materials ✓ ✓ ✓ ✓ ✓ Remote Control ✓ ✓ ✓ ✓ ✓ 1.4Inch black 2Inch black 2Inch white 4Inch black 6Inch white 2Inch white Materials Nanoscale material Nanoscale material Nanoscale material Nanoscale material Nanoscale material Nanoscale material Mini air pump Mini air pump Mini air pump 8W Air Pump 12W Air Pump Tube ✓ ✓ ✓ ✓ ✓ Air stone ✓ ✓ ✓ ✓ ✓ Nano air stone can not work can not work can not work ✓ ✓