Answers are grounded in this paper and cite their sources.
When new standards demanded new water‐treatment procedures, several Canadian plants switched to direct filtration. It was very quickly found that filters were clogging with diatoms and filter runs were therefore too short. The diatom problem was overcome in several ways, as described in this article.
No takes yet. Share an insight, caveat, or question.
Hutchison et al. (1974) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: