Actualy making the line 3/8th or 1/2" might do the trick.. the way thoes work the back pressure from the output sends a signal back to the unit which uses that pressure to pinch off the supply. so if you have a very long tube you will have compressability from the air in your water. also there is some give in plastic lines and when you are talking about a long run this adds up.. so what you have happening is the unit shuts the water off then as the water settles and compresses and the pex releaxes the pressure drops which allows your valve to flutter..
I still say the best way to stop it is to move your RO closer to the float valve. Also when yuo use a float valve it is going to flutter a bit as they are slow opening and not "ON" or "OFF" like.
Steve
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 *everything said above is just my opinion, and may or may not reflect the views of this BBS, its Operators, and its Members. If cornered on any “opinion” I post I will totally deny having ever said this in a Court of Law…Unless I am the right one*
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