The tek says that non-microwaved paste results in EA that may have trouble being reused:

Has anyone tried reusing EA from non-microwaved paste? Perhaps an experiment is in order where we make one paste, split it in three, and compare the yield from fresh EA, used EA from microwaved paste, and used EA from non-microwaved paste. This may be a little bit tricky because in an ideal world you would only compare used EA that you've used on the same source powder right? I have used EA from Bridgsii and used EA from San Pedro, but unfortunately I didn't label them. I suppose I could just mix them together to even them out right?

I am slowly convincing myself that non-microwaved paste results in a better outcome. I'll need to experiment more to confirm this, but the one time I tried non-microwaved resulted in my highest yield and white crystals from even the evaporate. All other times with microwaved resulted in yellow crystals from the evaporate, even while using  the same source cactus powder.

It would be nice if we could reuse this EA from non-microwaved paste. I live in a location where you cannot actually purchase EA and have to order it online which I don't like to do.