I am trying to price out my own construction of an 8gallon, 4x3unit undercurrent (12 site total-likely would have split running back to pump and epicenter). I am just curious as to what size pump the resident experts would suggest-reading over several DIYs shows me that pumps being too strong/too weak is a problem when constructing these undercurrents. I could not find the specs on a pump for an 8gall 4x3 design on UCs website... Thinking that around 1000GPH would likely do the trick..... but members like babyhughie have stated that 900GPH was more than sufficient in a 10site 8gal UC. Thanks in advance...