I love spare spools. Well, it's not a spare as in 'if one spool is broken' but I have several spools for all of my reels to use with different rods with different line weights as well as different types of lines.

For instance one of my favourite reels is the Orvis CFO III. I use it for #3-5 rods. When I go fishing I take several rods that goes with the CFO III. I have spools filled with any of these line weights in both DT and/or WF. Sometimes plastic and silk line. When I'm done fishing, I clean all the lines I fished, lubricate them and put hem back on the plastic containers (and box) they came with to keep them in the best possible condition for next trips.

I also have a few spools filled with old lines I use for lawn casting

Well thanks for the replies. I feel better about my choice to use the extra spool for the new rod.

Hey Bob. Whrlpool's post link covered the material pretty well.

Since salt came up, I only use a floating line in the skinny grass, where I want to drop a fly straight down.

Slime line casts better and fishes everything knee to waist deep.

So much structure on the TX coast are tide passes, and you time trips to hit them when the tide current is flowing like a river (may only get a half-hour there).
Only the TS-250 will get the fly down where you need - it's also a boon for fishing channel slopes.

So a well-planned day around the tides will use all 3 lines.

Not trying to derail the forum focus, but you can economize to a salt BFS rod and 3 lure boxes.
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Likewise, a hill country day can range from sliders over the shelf to bottom bouncing the tannin bottom (and not just for bass).

The problem with topping the old thread, which whrlpool shared with us, the 8-y-o fishbase.org link is defunct.
Usually a better idea to post on the current discussion, where current members have made their contributions.

ibookje - Fully understand what you mean... especially since I have the 508 reel you need
but most of the time I am in your shoes!

Kinda a great problem to have. Always being on the hunt for something.

Right meow in fact, I'm looking for mint SF706 spools.
And brand new System One 789 spools.