This is my soda kiln. It's a 36 cubic foot, hard brick, catenary arch, cross draft design which I fire to cone 10 (about 2375 degrees F).
Around 2300F, a solution of soda ash is sprayed through the many ports in the kiln with a garden sprayer. This spraying is done about
every 20 minutes until the draw tiles indicate that the desired coating of the soda has been achieved. The kiln is pre-warmed the night
before with a single, low flame on one of the burners, and the rest of the burners are turned on the next morning and that days firing takes
about 12-15 hours. The kiln is kept tightly closed for three days, when the pots and kiln furniture are cooled enough for unloading.