Thanks everyone! My container of demineralized water is holding out, but at least I know where to look when it runs out.
Does anyone find steaming in the APO insufficient from a moisture standpoint? I think the mandatory oven fan with the steam function is drying things out. I just did presoaked pearl barley at 100C 100% steam as per the Noma guide and it dried out. I also had issues with my koji growing at 30C and 100% RH where the cloth wrapping the koji also dried out and required spraying with water. I am now going to add a bit of water to the pan when steaming and I am wrapping my koji batch today in plastic to prevent moisture loss .
Growing koji has been awesome though so far. I can fit two 9x13 pans in the APO which is about 3x what I could fit in my previous setup. The probe and the app really help reduce constant monitoring and tinkering. My first batch was yellow peas with wheat which run really hot so once things started heating up half way through I took it out of the oven and finished the growth in ambient air.
