Do anyone know what I can use to kill bacteria in the waste veg oil?

I'm storing the WVO in totes. And when a tote is emptied, there is a little oil which is always leftover.
I'm worried that the bacteria from this oil will contaminate the new oil placed into the tote.

Charlotte, NC: 1000 gal

Charlotte, NC: 1000 gal WVO

--top grade WVO available now
--gravity settled and separated, and de-watered
--filtered to 10 microns
--can filter to 2 microns, upon request
--$1.75 per gallon
--sold in 250 gallon increments
--you arrange pick up


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