Mixing substrate - Toscanini's coffee amendment

See that in the bottom of the bag?

 

it's from a 5 gallon bucket of coffee grounds from Toscanini's in Cambridge.

 

This stuff seems to be working well as a mix-in substrate. I'm a bit concerned about the mold that grows on it. One observation I've made that may be useful is that the espresso seems more homogenous. Also, perhaps because they are stem pasturized as opposed to drip percolated, they seem to have less mold on them. they may also be pressed drier. In addition, I am uncertain about the coffee filters and how they will interact with the fungi. Furthermore, I'm not sure about the filters themselves and what they're made of. If the material is bleached, for example, that's something I think I would prefer to leave out of my cultivation process.

 

I consequently took two steps:

1) Called the company who makes the filters we use at home. I have yet to get a satisfactorily thorough response - only that they are 'safe for composing', and I felt that was more of a 'go away' answer than a well-informed one.

2) I have asked Toscanini's to set aside only their espresso waste.

Done