donperry

So I realize my system suffers from this. IT is a huge concern as it knocks enough by the time it clears the hose. I have a startup code that attempts to pure the system by spraying for a 200 ms once the airflow is above a certain voltage. this will purge it a little. But it's not enough. I'm wondering how much would a check valve work, if any at all, in reducing this.

Any ideas?