you could always spool with braid, then use a flouro leader.

Seagaur!!!!!!!!!!!!!!!!

Junk the the Flo and spool up with CXX p line problem solved

If you don't pick a bird nest all the way out it'll cut the line.

That's your problem.

Other than that, fluoro is junk. Spool up with a premium mono and you won't get bird nests.

When you put new line on your reels, do it with the line coming off the top of the line spool instead coming from the bottom and use some line conditioner. I use seagaur flouro and never have issues.

I have had this happen a few times with flouro and with PLine Flouroclear. In my case what curses it is letting the line loosen on the spool and eventually it will kink. Brittle lines will weaken hand eventually break. I watch for this now and will occasionally make a long cast and peel off line until I'm down into the neatly packed coils on the spool. I stretch the line as I reel it back on. No more problems.

I have been using Invisx for years and have never had this problem.

My dad, on the other hand, had this problem for a long time with Big Game. I noticed that he did not properly clear his backlashes.

I'm quite sure that your problem is your backlashes, either the way you are picking them out or you are not completely clearing them and loops or kinks are forming inside the spool

Yep.. Even a tiny loop left in the spool will slap around when you cast and eventually break during the middle of a cast. Line does not simply break for no reason while casting. This is an operator error. Fluorocarbon is stiffer than mono and less forgiving but it will not just snap in two for no reason.

Nobody mentioned this so I will add... DO NOT PULL HARD on your line when a back lash is stuck. This is the kiss of death. It will make the kink permanent causing you to repeat backlashes, and will also cut into the line. Funny how some people feel like they should just pull hard and the backlash will magically come out! Also, some fluros have more memory than others. Some are softer and some are more abrasion resistant. I prefer invisX for any light line applications and abrazX when fishing in and around cover. It is definitely more abrasion resistant, but has a little more memory. I'm actually starting to prefer abrazX overall... Nobody talks about it but it is dang good.

And copolymer has WAY more memory than pure fluro. That is the downside of it IMO.

I did not read through all the comments so if this is a repeat sorry. It is from loops in your spool due to backlashes. You can not get away with loops in the spool with Fluoro.

Some really good feedback here. I think the "breaking inside the spool" indicates you have damaged the line getting out your frequent tangles.

An interesting discovery by the Tackle Tour line reviews found that, first of all, fluorocarbon lines actually do stretch more than claimed, and average of 10.5% as I recall. But, another measurement that now goes into the Tackle Tour rating system for these lines found that fluorocarbon lines under constant pressure "deform," that is, they never fully recover from an elongation. That means they have been physically altered, likely weakened. More than mono or braid? I don't know but the fact that the material is often more brittle than the others means it would certainly be subjected to more of these sorts of line irrecoverable stresses.

This is just a nerdy way of determining that fluorocarbon is sensitive to cutting into itself, to kinks and wind knots, to stretching from which it doesn't fully recover.

One last idea, not for your predicament since your line is breaking off inside the spool, but for all lines and it appears particularly the fluorocarbon, you certainly wouldn't want to clip your lure or hook at the end of the day to the hook keeper, then crank down the line. It would create a sharp acute angle up at the end of the rod and a likely breaking point. Keep your line loose.

Brad

OH NO! HE SAID P LINE! pline= [censored]!
Unfortunately, you will try different lines along your flouro journey.
The Berkley vanish and the p lines are usually some of the first mistakes.
Even once you have moved on to quality lines ie. seguire and BPS 100% fluoro etc.
If you are for some reason to have some colossal backlash you are able to identify those distinctive kinks, and can learn to identify them. The better lines have a lot less trouble with spool kink breaks than others.

P Line CXX is a very good co-polymer line.

That depends on the co-polymer line you are using. Some have very little memory.