Comprised of volcanic rock, the microorganisms spores germinate when natural squander exists in drinking water, breaking down the squander and developing a healthy environment. Made out of volcanic rock, the micro organism spores germinate when natural squander exists in water, breaking down the waste and developing a healthful natural environment. https://hindibookmark.com/story19806119/new-step-by-step-map-for-fish-pond-maintenance-service