We have a natural pond in our garden that smells strongly of rotten eggs.
The local aquatic centre suggested installing a pump and filter system for about £450.
Is there a less costly solution?
Pond care, cleaning and maintenance in the summer.
The smell is almost certainly hydrogen sulphide gas, produced during the decomposition of dead plant matter.
Charcoal is an efficient purifying material. Try adding lumpwood barbeque charcoal (don’t use briquettes).
For a 9m (30ft) diameter pond about 1.2m (4ft) deep, 15kg (33lb) well distributed over the surface should be adequate. It will gradually sink as it absorbs impurities.
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