Try boosting the pressure and maybe yours will work. I know it's hard when you keep buying the same thing. Just I wish the one who sold you the others would of under stood that the supply line must be a least twice as big as the outputs for this idea to work properly.Just think of a spray bar out let for a canister filter, the idea wouldn't work if the out flow holes where the size of the tube. But if you blast it with a lot of pressure you may be able to over come this problem, of yo can go to the hardware store and buy 1/8 brass pipe fittings and make a rear feed line. But that is a lot of fitting and a royal pain, I'd probably just up the out flow pressure.