What’s with the range of densities you list?

Some people prefer to harvest different volumes depending on the growth rates of their algae. For example, clients harvesting a lower volume each day tend to reach higher densities. However, clients who harvest larger volumes per day usually get lower densities of algae, but the higher volume yields an equal, or even greater, number of cells per day.

Then within different strains of diatoms (thalassiosira weissflogii for example), many clients have different sized cells within the same species, which further affects the densities maintained with continuous harvests (with larger cell sizes correlating to lower densities, and smaller-sized-cells correlating to higher densities).