If your looking at the Vertex Air 1 XL2 consider the same system with the XL 4 head airstation instead. The Air One XL2, Air One XL4 and the Air One Plus all utilize the same cabinet and compressor.The standard Air 1 XL2 is not as effecient at depths below 20-22 ft the 4 head XL works best at depths from 15-35 ft and the Air One plus simply gives you more options with varying depths from 3 ft to 22 ft.At a 35 ft depth figure a lifting rate of approx 8000 gallon per minute or 11 million plus gallons per 24 hr day with the XL4 model.Pressure at that depth is not a problem.