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From R. SYDENHAM

The occurrence of brown tea scum may be drinker dependent (Feedback,
15 January, and Letters, 5 February).

Every day my wife and I drink two cups of tea, each made from the same
pot and in identical cups. All the water passes through a jug filter of
activated charcoal.

Observation over several years has produced the following record of
scum incidence: Wife – nearly always, self – hardly ever.

Probably there is a supping factor, or there could even be a gender
effect.

R. Sydenham Eltham, London