I dose the equivalent of 34 mls of vodka for 550 gallons but I'm on the low side and every system is different;many dose around 1ml per 10 gallons when amped up fully;some more; some less.
You could try a little vinegar in lieu of some of the vodka. It takes 8ml of vinegar to equal 1ml of vodka due to variations in dilution. Vinegar is 95 water; 80 proof vodka is 60% water.
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