Depending on duration of vessel sailing and temperature, the calcium suspension can settle and temporarily solidify due to weight of liquid above it.
This is a simple system for mixing contents of IBC before decanting.
Using a drill mixer with a long extended paddle as below
This can be combined with pump circulation using a simple 1″ or 2″ piping system.
First time; use both pump and drill mixer is better
Subsequent: air agitation or stirring with wooden lath should be sufficient