Two major features of ecosystems are (i) environmental pollution due to significant random accidents which disturb homeostasis, and (ii) the slow rate of recovery from such accidents. We should consider a "zoo" from which it would be feasible to re-seed damaged ecosystems with organisms of appropriate types, in numbers sufficient to trigger rapid recovery of homeostasis (or "ecolibrium"); the zoo would function as an ecological flywheel. We consider a water resource system.