What I was clearing my swamp I was using an old used filter I found in the garage of my new house. Cleaned as best i could with my hose it was run at 10psi, when it hi 18 or so I would clean it and it would go back to 10. Now that the swamp is gone and my water is crystal clear as well as 0 debris, I switched to my brand new filter. Fired up the pump and it reads 0?!?. I thought I did something wrong so I took it all apart and put it back together again. Still 0. So I figured maybe that is just normal. So it has been running the new filter for 3 days at 4 hours a day. Still 0. Is this normal?