Flow?! You want flow! I'll give you title wave flow!! 12,000gph if you want to max these puppies out!! Used less than 1 year! 2 pumps and 1 controller per package. Retail price: 1x pump $309 1x pump and controller $449 Total package: $758. My price is $300! Spare rotors never used included. Plug and play simplicity! Thanks for looking!