Does anyone have a good estimate for how many check valves should be used at around 7 - 9 psi... can you have too many?
Any advice is greatly appreciated because im stil coding with 4 check valves on there

 

4 is a lot most ppl have 2 or 3, and no u cant have too many.. maybe yours are hooked up wrong.

 

try running ohe then 2 then 3 and so on till u get no code and if they are the ones like u would get at a pet store there should be (atleast mine) a rubber "arrow"in side or a rubber piece it points in the direction of airflow

 

I had problems with 3 at 7psi. I'm using 5.

 

im going to try 5 and then 1 2 and 3, i appreciate all your guys help and comments, ill try and keep ya posted
mike