Primary Reel

[LKunze]

The next size smaller from #24 I believe is #18.  You can get that at Home Depot.  It's labeled as Mason's line and comes in fluorescent yellow and pink.  I have that on one of my spools.  That's what we used for the guideline in Lake Mine that runs from the pillar out to the buildings site.  It comes in 250' and 500' spools.  You can probably get longer spools online somewhere.  The main thing is to make sure you get the braided line and not the twisted variety.  The #18 works alright for open water guidelines but probably not a good idea to use line that thin in an overhead environment.