South Grotto Fountain Geyser is a fountain-type geyser. It usually only erupts toward the start of a Grotto Geyser eruption although it has been known to start just prior to an expected eruption of Grotto Fountain Geyser and delay the start of that geyser and as a result the start of Grotto Geyser.
Intervals for South Grotto Fountain are about the same as those for Grotto Geyser, 6 hours to over a day. Durations are around 30 minutes. Its maximum height is about 15 feet. It makes a pretty companion for Grotto Fountain Geyser.