Socal, your concentration sounds a bit strong... I think you want *5 drops* per 5 gallons of water.. Last time I mixed a batch that strong, I had to use some of it to shower with and it was so harsh it made my skin itch later in the day, non stop.
If Im not mistaken I went to 5 drops for 5 gallons and have had zero problems... water is stored in cool & no direct sun (no UV).
EB
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