Looks great! Do you use the PH meter to also determine when the cold ferment is done? Is it worth getting a meter?
not a native speaker, but my 2 centavos are (very simplified):
in use:
Le mando notas: i send notes to him
Le mando las: I send them (as in the notes, female) to him
perplexingly, le can point at female or male objects, it's a indirect object pronoun for both sexes
maybe that makes it clearer:
https://www.mytutor.co.uk/answers/5950/A-Level/Spanish/When-is-it-right-to-use-lo-la-and-le-in-Spanish/
Edit: I did like five edits to that already, I agree this shit is confusing.
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