Hi everyone. I'm new here, and my just wanted to pick some plumbing brains about air in my water lines. If you turn on any of my faucets, 9 times out of 10, there will be a big spit of air that comes out before any water. After the water starts flowing really good, there might be a spit of air again several times but it is completely random. If I drain my lines, usually at my pressure tank in the basement it stays good for around 5-7 days. No air whatsoever. But after that it just comes back same as it was. Of course I could keep draining every 5-7 days, but I'm kinda curious why I can't keep this air out of my lines. Am I bleeding the lines wrong? Is there something I'm overlooking? I usually overlook obvious stuff lol. Like I said it works great for about a week after I drain. Not sure if this could be a tank problem? My tank was put in in 2007, by the company that drilled my well, and It's a fibreglass tank not steel. Or could it be a pump issue? But if my pump was sucking air somehow, would it clear up after I drain my lines? I just figured if it was the pump sucking air, I'd have air all the time. I'm no plumber by any means, I can do the basics, but stuff like this I figured I'd start with people that know what they are talking about. Which is why I'm here. Any help would be greatly appreciated. Thanks