Please advise whether twin 10" will be too large for 2 people.
I obviously like to with higher diameter to reduce pressure loss but try to avoid channeling as well.
Is twin 10" for 2 people will be okay or risky for channeling?
I think we use one tank in one week or so.
Is it okay for another tank to stay without water for 1 week?
Or I should go with twin 9" instead?