I'm figuring on dropping the water from my overflows straight through the socks and into the tub. Then, with the two pump idea, even though I've only got one pump with the dual discharge, use the one discharge to push back to the tank and the second to put water over the scrubbies. I'll valve that line to control the amount of flow. Even at the head I have from the basement up to the tank, I'll have at least 5 times turnover in the tank giving the rays some good flow. As Hannibal said on the A-Team, "I love it when a plan comes together!" 

