Completely changed my perception of chromatography with clarity. Thank you sensei 
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A healthy combination of the two 
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That finally gives words to the important differences between a scrub and a column pass.
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Can a chromatography column also work with vacuum pulling from the bottom vs pressure coming from the top of the column?
It can, but it is ill advised, since vacuum will cause many solvents to begin vaporizing, forming gas bubbles in the column and screwing up the process.
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That makes perfect sense. Thanks for replying
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Can ypu explain how to spot a good and back molecular sieve?
When h20 is absorbed into the beads they release heat. Start by activating your mol seives, then take say a gram of each sample and place them into a test tube or other small vessel with a thermometer. Pipette 10 ml or so of h20 into the tubes ontop of the beads and record the sample that produced the highest temp. The higher temp sieve sample you find will most likely be the best candidate.Look for other things as well such as durability of the bead, you don’t want weak beads that break down into dust easily.
So in a nutshell, compare their performance and physical strength. Beware… there are shitty mol seives on the market, also stay away from the ones with an indicator.
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