VolumeAir Round Ceramic Air Stone 4"/100mm Hydroponics, Aquarium, Fish Tank from Grow Central

Helps to increase the oxygen levels where required A quality air diffusor Suitable for fish tanks, aquariums, ponds, hydroponic systems and nutrient solutions Available in a range of sizes (100mm, 150mm and 200mm) Required pipe and air pump (sold separately) to oxygenate