Aluminum is attacked by both acids and bases. Referring to the chapter "Corrosion in Wastewater Systems" in ASM Vol. 13C: Corrosion in Specific Environments, on page 25 it says "...Aluminum is not recommended for use in fluid exposures, due to the wide range of pH values found in wastewater facilities.” Based on this, I would advise against using aluminum in your application.
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