I'll probably do a 2L starter.
Reportedly, mangrove jack m07 is a dry wlp007 strain. Was wondering if this is confirmed. I used on last batch. It worked spectacularly and flocked hard, fermented fast.
..do a cell count and viability assessment.
What makes you believe the yeast froze? I think that yeast clumps anyway. make a starter and find out.
The S-05 will be OK. Since it is dry, there is no moisture to rupture the cells.
By the way, when I mixed the liquid in the vial container prior making my starter, it mixed but the final liquid looks not fully mixed.. still clumpy. Like this :
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