My pump/filter splits to six pool returns and one spa return. There is no valve to control the spa return. I would like to reduce the volume of water on my spillover from a loud waterfall to a slow/quiet trickle without reducing the pump speed.
My thought was to just reduce the eyeball return in the spa from a 1" to a smaller 3/4" or 1/2" orifice. I don't think this will affect pump efficiency/filter pressure much (if any) since more water will just divert to the pool returns. I also don't think filtering and chlorine levels in the spa will be affected much since it is all a connected system.
Is there anything else that I am not thinking of that may cause harm by changing the spa eyeball return?