I actually have a 5 gallon bucket of the good stuff from BRS, but have still just been working through the box from Target. I ran the cheap stuff before and everything was fine.

I'm not saying what I do is "the best" way to do things. Yes, I just add some to the sump, in a separate are than where my return is, and it's very turbulent on that side with a small opening high up for transition of the water to the return area.

Todd