Dwell time = reaction chamber volume ... ... ?
Air volume must be taken into consideration regardless of how long the said volume dwells. Even IF an elaborate formula exists there are also many variables to consider; like skimmer type. Different types rely on dwell time much less than others. Some types (based on their dimensions) rely more on how much air they induct rather than how long it lingers. More and much finer bubbles compensate for less larger bubbles that linger longer with much bigger skimmers.
I truly do not want a debate ... all my point is ... many if not most manufacturers will not list the most important data because the data is what distinguishes them.
Dwell time would be nice too on the list
