A100 Disc Air Stone is a heavy duty 100mm sintered disc air stone that delivers a steady stream of fine oxygen bubbles for reliable oxygenation of fish ponds, koi ponds, large aquariums and aquaculture tanks. Made from durable sintered mineral material that resists clogging, the A100 provides better bubble distribution and finer bubbles than cylindrical air stones, making it an excellent mid-range disc diffuser for Nigerian fish farmers upgrading their aeration system.