What then, are the advantages to individual hoses?
A.1. Simple, common sense physics to start. You will get more breathable air delivered through multiple hoses than through one. A.2. The aforementioned separation (13.Q.), which equates to freedom (See, also, next answer). A.3. Imagine being at a depth of say 60 feet around some coral, wreck or rock formations. With the floating, individual hoses you can easily maneuver about unobstructed. On the one down hose at 60 feet, the 20 foot whips will be effectively horizontal, restricting movement to follow-the-leader. A.4. Let’s talk SAFETY! At 60 feet on individual hoses, if one diver needs to reach the surface for any reason, he/she can calmly do so, hand-over-hand to the security of the float or boat. On the single hose, the stressed diver can only ascend 40 feet, the total of the two 20 foot whips. At that point he/she would have to jettison the towing belt, with the regulator, and swim the remaining 20 feet to the surface. A.5. More on SAFETY. In the event of equipment failure, there w