How Much ............... to regenerate spent compost

[TrysHard]

As a rule of thumb I am using about 1 handful of BFBM per bucket of used compost to regenerate it - is that about right

I am just going to to do about 600 litres of compost so need to up-scale it a bit -

Any advice appreciated.

[Potstubsdustbins]

I use a good handful to about 30ltrs, but I also give extra feed as the season goes on.