Why shall I cool it down? My idea was to heat it up, pour it on ket, swirl then let it cool down. Finally push it through a small diameter metalic fillter.
Update: water molecules may stuck inside of the crystals, decreasing the purity. Solution: dissolve it in 99.99% pure, food grade ethanol then evaporate it. The water will bind to the ethanol and both will evaporate.
First put the chloroform in the freezer for a day
Put some cloth around a tube. Put the ketamine inside. Wash it with the cold chloroform en let the chloroform drip out
Then let it dry out and put it trough a sieve
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I hope the impurities are soluble in acetone.