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Hello everyone, I am a green beginner and this is my first post so go easy on me if this is a subject that has been discussed to death or is so obvious it doesn't need explanation. I have done a search but only found one thread that seemed to touch on it slightly, which was someone asking whether some LSK rope they found on ebay was legit. I am just gearing up (just for recreational and hobby purposes for forseeable time) and the bit of gear that has been left till last has been the most important, the climbing line. Because it is somewhat confusing what types of rope is suitable, and because anything labelled / marketed for Arb use costs at least twice as much as seemingly identical but less excitingly coloured alternatives. Would anyone care to share experiences and information about the use of non arb line as arb climbing line and how well or badly they functioned for the purpose? From the information I have seen, it seems that all these varieties of rope have a similar construction braided polyester, nylon or polypropelene with dyneema or aramid cores available in marine rope. Arb specific rope seems to prefer lower strand numbers (for durability?) , half inch diameter for traditional blakes hitch climbing and 10mm-12mm for SRT with devices. Every explanation of why only Arb specific climbing line is suitable for trees (compared to other semi-static ropes) is that they hold arborist knots while others (caving, marine etc) do not. But the manufacturers descriptions of most modern semi static rope offerings from safety equipment fields and especially rock climbing companies like Edelrid, Petzl, Tendon, Beal etc.. emphasise "Excellent knottability". Are they lying? Is excellent knottability in mountaineering terms actually piss poor in arborist terms?