Just about everyone is using Gast vane compressors. You need to look at what kind of diffuser you're buying for best performance. Size, if they suspend or sit on the bottom, durability, ease of cleaning, bubble size, and water turnover rates should be compared. You can spend about $50-$450 on each diffuser. Price is usually comparable to benefits. the Mix Air brand is designed for wastewater treatment where the maximum oxygenation is needed. Their water turnover rates are incredible and university tested. fishmgr@hotmail.com
