I've had really good luck with Seaguar and Orvis fluorocarbon. I use a modified Homer Rhodes loop knot and haven't had a knot pull loose. The modification involves the first overhand knot. Make the overhand knot as though you were tying a Surgeon's knot - make the knot by putting the tag end back through the loop formed by the overhand knot. The strength of the knot is there, it allows the fly to swing, and the knot doesn't slip.
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