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Two separate questions.
On using fertilizer grade DAP (specifically and only Diammonium Phosphate containing) and or urea in the pills form. What are the realistic downsides? I have tried it. And with a small dose (100-150g per 200L wash) and the right recipe it doesn’t seem to throw "off" flavors, but it does help the sugar/panella and "other nutrients" wash ferment along by bumping nitrogen over the line. I’ve ordered some food grade DAP but it’s expensive and a pain to get it delivered and through customs. This is actually a big benefit to cost for us. The expense/cost to obtain food grade vs fertilizer grade is quite high/liter.
What’s the nitrogen source in the wine/distillers DAP? Is urea safe? What dangerous things introduced or created with fertilizer grade could be passed through 2 runs in the column? Is there a serious product liability issue? WHAT COULD I DO TO MITIGATE THE RISKS?
Second question. I found a product by still spirits called liquid carbon. I’m assuming it’s activated charcoal crushed and suspended in water in a convenient dose sized package.
Who has tried this? Does it work? What are the benefits? Cost benefit analysis?