Maybe he needs to use the second rack or no rack at allAh yes, but........
The upper cylinder can never be more than about half full as once the level in that exceeds the open top outlet in the lower one, it will overflow!
Can't beat a watering can, top of the aquaroll regularly and you only have to carry a watering can full, rather than dragging the aqua roll(s) to the tap.
There should be no reason to need to lower a barrel, becasue the water levels will equalise becasue of the connecting hose.I'd imagine he has both cylinders on racks when they are full, then takes the primary cylinder off the rack when the cylinders are down to 50% capacity.
Please can you explain your thinking? What exactly do you mean by "feed"?The need to lower a barrel is because the two barrels will equalise and not, therefore, feed. The barrels being 'on their sides' is, as per Jcloughies post, due to the position of the inlet.
Thank you for your thoughts, but that could not be the case, becasue the barrels both need to be able to draw air in as the water empties out, so the upper most caps have to be able to allow air in. As such the connection between the barrels (the blue pipe) will always allow the water levels to equalise in both barrels to achieve the same horizontal level. That means the lower barrel will contain more water than the upper.There's a positive head from the upper to lower barrels giving a feed i.e. decent pressure from higher to lower. If the stillage of the upper were also angled it would drain further than if level.
An interesting photo but not something I would faff about with myself, I use a similar regime to John in post 6; swap aquarolls after evening meal giving enough for the next day.