You can use it on both Chris.
However, with any sort of current on a river it is sometimes better to use mash as opposed to liquidised because it'll reach the bottom quicker before breaking up. Liquidised can get washed downstream before it has a chance to reach the bottom.
The only other option would be to add a binder instead.
Liquidised is fine on a stillwater as there won't be any current to affect it's fall through the water and the particles are much finer making an attractor that won't fill the fish up.