1 umol DNA CPG Synthesis Column; 26 mg of CPG with an average loading of 42-46 umol/g, so 1092-1196 nmol. Yield is always 40-60% of scale. 

These columns are NOT underloaded like competitor columns where a 1 umol column is actually a 700-800 nmol column.

In this case, the column will produce a quality oligo if used with a 1 umol Protocol, but yield will much lower than expected from a TRUE 1 umol column.