Ilford Delta question

I have been using Ilford Rapid Fix at the recommended times and dilution with Delta 100 and 400 for about 2 years and have only had excess magenta cast once. I usally wash (with no wash aids) for about 20 minutes at a fairly low flow rate in tap water. I wonder why there is so much variability with fixing. Perhaps there is a problem with shelf life or something.

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