Asked by kuittinen.mikko ·April 3, 2023 ·7.25k readers

WCA SCOBY

Hello fab fam! Ive noticed the scobys going thick n wild on my both WCA brews. Other one is made with roasted eggshells and the other with chalk powder. And it grows so fast! Any ideas about this? Can it break down calcium so my brew is less potent? Vinegar is made from FPJ comfrey left overs. I have to say I like the chalk version more, since its missing the burnt smell and seems more clean. Amazing stuff anyways! I also made patch with spirit vinegar and limestone crumble, and it sure did have some spirit in it! Love y'all!

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shelf-life limestone chalk comercial finland

From the KNF library

From the KNF library Drafted by Claude from Office Hours and the books · Sep 2026 · 4 sources

Drake's WCA recipe, from Cho's solutions sheet:

Mix 1 part eggshells with 10 parts brown rice vinegar by weight (Cho's Solutions, p. 13).
Dissolve for 7 days under a breathable lid, stirring daily (Cho's Solutions, p. 13).
Separate the liquid and store it under an airtight lid (Cho's Solutions, p. 13).
Keep the finished liquid out of direct sunlight (KNF Demystified, p. 40).

The library lists living vinegar and a mother scoby as ways to speed up banana vinegar (Cho's Solutions, p. 8). It says the key step for eggshells, seashells or crushed coral is to toast them first (Pure KNF Manual, p. 51). It names crushed coral as a commercial calcium carbonate source for larger batches (KNF Demystified, p. 40).

The library does not say whether a scoby breaks down calcium. It also does not cover chalk, limestone, spirit vinegar or vinegar made from FPJ leftovers.

Sources

p. 13 Cho's Solutions · “Mix 1 part eggshells with 10 parts brown rice vinegar by weight • Dissolve for 7 days with breathable lid • Stir & agitate daily • Separate and store liquid with airtight lid”
p. 51 Pure KNF Manual · “This can be made from eggshells, seashells or crushed coral. The key is to toast it first.”
p. 8 Cho's Solutions · “Speed up the process by adding a splash of living vinegar or adding a ‘mother scoby’ from an existing vinegar.”
p. 40 KNF Demystified · “Pour off and retain the liquid and store out of direct sunlight. For larger batches, commercial sources of calcium carbonate can be used, such as that from crushed coral can be used.”