Concrete Eggs - Any Experience?

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radarsock
beers 1223 º places 112 º 23:00 Thu 7/27/2017

Anyone have any experience with concrete eggs fermentation vessels from Sonoma Cast Stone?
From their website:
"Concrete can take the heat, or the cold. It’s a natural insulator and will stabilize the temperature of whatever is inside of it. This stability makes for a smooth and gradual fermentation, because there are no temperature spikes to make the yeast become aggressive. For the same reason, concrete is also ideal for storing and aging wines. Sonoma Cast Stone also offers a unique temperature control system. Our system is hidden within the walls of the tank itself and does not make contact with that wine. [...] "Winemakers all over the world are rediscovering the benefits of using concrete as a medium for fermentation, finding the virtues of both of oak and stainless steel with the drawbacks of neither. Now, most of the world’s highest-rated wines are made in concrete.
Concrete is cool! No... really.

Concrete can take the heat, or the cold. It’s a natural insulator and will stabilize the temperature of whatever is inside of it. This stability makes for a smooth and gradual fermentation, because there are no temperature spikes to make the yeast become aggressive. For the same reason, concrete is also ideal for storing and aging wines.



Sonoma Cast Stone also offers a unique temperature control system. Our system is hidden within the walls of the tank itself and does not make contact with that wine.
Just breathe!
Concrete is porous, albeit on a microscopic scale, and that’s where it beats stainless steel. The environment in stainless steel is too perfect to be ideal for fermentation. Without a gradual introduction of micro-oxygenation, the wine remains flat. It cannot breathe and evolve.
Wine fermented in concrete has the round mouthfeel of wine fermented in oak, but it has much greater purity of fruit flavor, even a greater intensity of fruit color. For fermentation, storage or aging, concrete is simply phenomenal."

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