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Doing some safety research. Found some toxicological case reports about Potassium Hydroxide KOH below. From this it seems safer and better to use Potassium Bicarbonate which can be used as an actual chemical buffer against acidity, and isn't a strong base like KOH, which apparently can melt your eyes out:
https://toxnet.nlm.nih.gov/cgi-bin/sis/search/a?dbs+hsdb:@term+@DOCNO+1234
/CASE REPORTS/ We have prospectively studied 31 patients who ingested strong alkalis for...
Potassium Hydroxide is nasty stuff
from Hydroponics / Aeroponics
Read more How to fix this hydroponic problem
https://toxnet.nlm.nih.gov/cgi-bin/sis/search/a?dbs+hsdb:@term+@DOCNO+1234
/CASE REPORTS/ We have prospectively studied 31 patients who ingested strong alkalis for...
Potassium Hydroxide is nasty stuff
from Hydroponics / Aeroponics
Read more How to fix this hydroponic problem