Aeromixer is a pump made specifically for growers, by growers, with a dual purpose: to mix nutrients and aerate feeding solutions with just one pump. Aeromixer makes feeding large and smaller gardens a breeze and reduces the need for air stones, air pumps, and pH up and down additives.
Picked up a used Twister T6 for $400 and replaced the gear box for $100 and now its like new again.