Thanks for the info, guys. I found the specs on the matala website (https://www.matala.com.tw/aeration/products-31-2.html). It looks like at 10/15 feet the cfm output is 2.5/2.4, respectively. The spec sheet specifies that this is with a two way manifold, does that mean each diffuser will have that cfm output, or would it be split between the two? If it's split, would it be best to have one diffuser at the deepest part of the pond rather than two?