Tex, I got it from Premium, ESV all the way...

The blue thing is an Aqualifter pump hooked up th a float switch in the tank, it works great and theyre like $12. The mix pump is on a timer and the doser is also, the mix pump is set to go on just before lights out for 15 minutes and the dose pump is set to stay off for 2 hours after to allow for settling. Its the internal plumbing that makes this reactor different from most DIY's.

Steve, are you using one of these reactors?