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mcharles

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  1. I've got a few thoughts from my background as an engineer that does a lot of work with drinking water. I don't do a lot of work with sanitizing surfaces and materials like clay specifically, so take it with a grain of salt, but the fundamentals are similar. Bleach is excellent at killing viruses, even at low concentrations. At one to two parts per million of bleach, viruses are killed within a matter of minutes. If you have very liquidy slop, adding something like 40 drops of bleach per 5 gallons could help (this is based on CDC guidelines for emergency disinfection of water). The problem is that the viruses can get trapped inside clay particles and get protected from the chlorine. So, it could help but wouldn't be reliable. UV doesn't make sense to me as a viable solution in this case. It'll be useless for solids clay and inside any slop bucket, because the water/material needs to be relatively clear for UV to disinfect. Also some viruses are highly resistant to UV (much more so than some particularly nasty parasites that chlorine can't kill), so I wouldn't necessary trust it for coronavirus given how little we know about it. So I don't see any reason why you'd deploy UV for ceramics specifically in a different way than you would in any other classroom. Heat is a good way to kill viruses (one study I found is showing high levels of inactivation at 60 degrees C and 30-60 minutes of contact (https://www.journalofhospitalinfection.com/article/S0195-6701(20)30124-9/fulltext). I wonder if you could do a "solar oven" type project for your slop/reclaim buckets and get it hot enough - it would be an interesting project!
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