it did both - Wizard will correct me if i'm wrong. you could increase flow to the anniversary pool by shifting sand bags, decrease flow to the womb down the chute. i've done that when the anniversary pool was not warm enough during cold moments. but normally water was flowing into the anniversary and down the chute to the womb, but some would overflow the anniversary and make its way down the channel to the womb as well. This channel is now dammed and has the small pool in it. the womb of course has multiple sources - and has been getting hotter in recent years?