Super, thank u for pics and video. Great minds think alike, lol . You set yours up very similar to mine. Where did u get the flex tubing, is that the same as spa-flex? Did u modify the overflow or r u using the stock overflow? Your return pump is on the floor of the basement, or close to it, so you must have more that 12 foot of head pressure. Figure 7 feet to basement ceiling , 1 foot through to the main floor, 5 feet to top of tank, the I assume your splitting it to get return flow to both sides of the tank, so that adds another foot for the "T", then 90 degree bends to get the hose back into the top of the tank, right. So that adds up to 7+1+5+1+2= 16. That's what I am figuring for my head pressure.