this is super easy and cheap, ...
Published by Eros Kaw, Biocleaner Inc. - Chief Tech Support
this is super easy and cheap, Anghel. put in a small in situ bioreactor. it will keep on producing probiotics for many years. you never have to buy microbes. the probiotic will remove all H2S smell. and you don't need to buy, you can rent for cheap for many years.