Do I need one or two reservoir mounts?
If you are using Ethereal single then in most situations you are going to need two reservoir mounts.
Protium pump and reservoir combinations have two other mounting systems which can be used in combination with a single reservoir mount.
So if you are using Protium and you want to use one of the other mounting options we have available, you will only need a single reservoir mount.
Core is different, (being a dual clamp mount) one can be used to mount a Protium 100/200mm reservoir.
It is recommended to use two reservoir mounts for anything above Protium 200m, even if you are using Core.