EasyPro™ AquaFloat™ 24" Floating Fountain Heads Size:Wide Umbrella ONLY In testing they produce a Flow Rate at 20 Feet of Head_11000 GPH In testing they produce a slightly larger air bubble than air stones which translates into less oxygen transfer into the water Safely Eliminates Foam from Ponds Fountain Performance Chart Rocket Wide Umbrella Spray Pattern GPM GPH Feet of Head Pumps to Consider Spray Pattern GPM GPH Feet of Head Pumps to Consider 6'h x 3'd 40 2400 10 Matala Versi Flow V 3900 4'h x 15'd 62 3720 11 Aquascape 5 PL 8'h x 3'd 45 2700 13 Matala Versi Flow V 4700 or EasyPro HTH250 6'h x 20'd 77 4620 14 EasyPro HTH400 10'h x 3'd 51 3060 15 Aquascape 5 PL 8'h x 24'd 82 4920 19 Aquascape 9 PL or EasyPro HTH750 12'h x 3'd 55 3300 16 Aquascape 5 PL Feet of head column is the amount of pressure the nozzle requires 14'h x 3'd 61 3660 20 EasyPro HTH400 or Matala Versi Flow V 5600 16'h x 3'd 65 3900 23 Matala Versi Flow V 5600 or Aquascape 9 PL Select a pump that will deliver the gpm @ feet of head shown Current Manufacturer Shipping Lead Times are shown here