https://youtu.be/nx1HpYhSo0A
Carls you tube video from USA his mates he joined up with used them they go to mush like soloubles and leave attraction in the water seems like a good idea,anyone tried them out they come in 6mm pellets and include natural ingredients including molasses(BREAM!!!).
I know carp fishing bait wise is a little different to uk eg pack bait like rice,cereals and maize etc just thought it maybe something different to prebait with.

https://thompsonandredwood.com.au/cattle/cattle-cubes
Note
Not a bad video as well battling the elements there a few times as their no bows got blown all over place well worth a watch for something different