I'm planning to repot my bonsai march time . I have this Growth Technology Bonsai Soil which contains peat, fine grit, sand and fine bark. I fear I may not have quite enough for a full repot . However I do have some akadama and I was wondering whether this soil is compatible for mixing the two.

Thanks in advance !

The components in that bag mix kinda spook me out. Most of the material is very fine, which isn't good for drainage. I stopped using peat & sand in my mix because my soils stayed too wet. Mixing it with akadama will help to make it more coarse. Just take care to not have a soggy tree.