3 Effra ponds. These three bottles contain waters from the ponds of Dulwich. Bel Air & Brockwell Park. (Dulwich: Cocacola Zero)(Bel Air: Silver Cup)(Brockwell: Malvern). It was hard to collect water from Brockwell, it required a shoe string and a stone – one of these should be an opaque bottle to reflect the underground river Effra.