I have 30lb PP on my reel and half way into the spool, there is one knot. Not sure how it got there, maybe a backlash. But it's too tight to untie. Will this compromise my line? Every time I cast, the knot goes through the guides.

A wind knot... a lot of times you can just pull those loose by pulling on both sides of the knot in opposite directions.  

No, wasn't a wind knot. I pulled this and it just got tighter. 

1 minute ago, FrankN209 said:

No, wasn't a wind knot. I pulled this and it just got tighter. 

Yeah, it gets tighter and if you pull it hard enough it will pop right out...sometimes it will break the line.  It's a gamble but nothing you can do about it...

Best bet is to replace the line.

It happens alot with braid, especially the more limp 8 carrier versions.

Had it happen and won't tolerate an unwanted knot, cut and retie. 

30 minutes ago, FrankN209 said:

I have 30lb PP on my reel and half way into the spool, there is one knot. Not sure how it got there, maybe a backlash. But it's too tight to untie. Will this compromise my line? Every time I cast, the knot goes through the guides.

 

7 minutes ago, mrpao said:

Best bet is to replace the line.

It happens alot with braid, especially the more limp 8 carrier versions.

Ya - if you've filled the spool with that 30# here's what I'd do.

Strip off back to the knot and cut - toss.

Strip rest of line off.

Put on some cheap mono as backing - Big Game is good and inexpensive (it's what I use for backing) - fill spool about 1/2 to 2/3.

Tie the braid to the backing - double uni is what I use here.

Fill the rest of the spool with the braid.

25 minutes ago, FrankN209 said:

No, wasn't a wind knot. I pulled this and it just got tighter. 

It happened quite a few times with my 8-10lb braid line. As @JediAmoebamentioned try it nothing to loose, if you plan to replace the line anyway. You don’t want any knot on your braid, more trouble, bigger knot will follow.

Yeah, I took line out to the knot, wrapped the line around some wrenches, for grip, pulled and it snapped at the knot. I'll just replace the line. 

works well in windy conditions 

https://www.finsfishing.com/FINS-Windtamer-p/fnswtb-.htm

 

47 minutes ago, FrankN209 said:

Yeah, I took line out to the knot, wrapped the line around some wrenches, for grip, pulled and it snapped at the knot. I'll just replace the line. 

Problem solved.