You cleared the filter but I don't read anything about you cleaning the tank or killing the microbes. I went 25 years without additives also but I now add 12 oz of TCW 2 cycle oil and 2 oz or Startron on at every fill up (fuel quality has gotten worse in the last 25 years). I don't know what the micron rating is for coffee filters - probably depends on the brand. You just want to get rid of the biggest clusters. The Startron will do the rest.
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