If the rock hard part sticks to the bottom, just put some water in the bottle and heat it some in the microwave and let set. Then shake the bottle and dump, or empty into a sieve, the hard is rock candy. If some still is stuck on the bottom, repeat. No need to toss the bottles, for home use, I never reuse glass (or plastic) for sale to the public.
You just need to filter it, use 3-4 pre filters inside a cone or flat filter. As the 1st pre filter gets plugged, slide it out, and continue filtering. Syrup should be filtered at above 195, then bottle it between 180-190, your syrup will be clear. For density, get a hydrometer.
Dave Klish, I recently ordered a 2x6 wood fired evaporator from A&A Sheet Metal which I will be converting to oil fired
Now have solar, 2x6 finish pan, 5 bank 7x7 filter press, large water jacketed bottler, and tankless water heater.
Recently bought another Gingerich RO, this one was a 125, but a second membrane was added thus is a 250, like I had.
After running a 2x3, a 2x6, 3x8 tapping from 79 taps up to 1320 all woodfired, now I'm going to a 2x6 oil fired and a 200-425 taps.