I suppose you can use any medium but they were made for peat pods.
The start can be used when your in flush or dry cycle so that you can skip germination or early veg in the grobo!
You can also use it to grow spices when not being used for grobo!
Really saves time for sure, cuts your grobo grow time so you can harvest sooner!
There should not be a reason to raise the pods, I see a lot of people doing this and not getting to the root of the problem that something has to be off in the machine because the pods were designed to sit flush with lid.
If you had to raise the pod it isn’t possible because the top of the pod holder holds the peat in place and the holder has specific grooves that lock into the lid designed to hold the transfer.