i'd stick a piece of sponge or filter material around the intake to the pump/filter.....just some form of restriction. Depending on if it is a cylindrical intake (tube), you could try and find a gate valve that fits it so that it would be more accurately adjustable. If the return is in the shape of a nozzle you could try and connect a diffuser to it..... sorry, this is all I can think of. I just saw your post getting no action and thought I would throw some thoughts at ya.


Randy