Empty growmore tub.

I don't have access to oodles of free pooh so Im limited to the chicken waste (not a lot) and artificial fertilizers for the garden, the 10Kg tub has lasted around 3 years so I don't use that much either. Looking around I was wondering if I should restock the growmore or get a slow release product   I had to stop using the BFB or chicken pellets because of foxes - they seem to ignore the fresh though 

Liquid feed tends to just run away in my sand pit  I dug up the comfrey bed and binned the press as the hassle and loss of space exceeded the reward.