ShLUbY
Well-Known Member
definitely agree on the oyster shell flournot a problem at all, and it's basicly inert, so it's a good thing.
keep in mind there is a good amount of perlite in it, which is fine, but it does take up some of the space.
a 1/1 ratio would be fine though, may want to add a lil oyster flour if you plan on re-using the soil, the d-lime in the promix isn't longlasting ph control