Six options side by side

Option What it adds Acts before or after H2S forms What stays downstream Works on FOG and sludge Best fit
Bacteria additives An outside bacterial culture After: needs oxygen or a niche to establish before it works The added culture, competing with the native population Some formulations, if they establish A system with little native biological activity to start from
Enzyme products Manufactured enzymes After: breaks down existing material, does not stop sulfide from forming Spent enzyme residue FOG mostly; limited effect on the gas A grease-heavy line where gas is not yet the main complaint
Iron salts An iron compound After: binds sulfide once it exists Iron compound requiring removal or settling No, gas only A site that needs a fast odor knockdown while a longer fix is arranged
Nitrate products Nitrogen compound Before: gives bacteria an alternate oxygen source to sulfate Added nitrogen No, gas only A force main with the flow and dosing access to sustain nitrate addition
Aeration Air (dissolved oxygen) Before, where it physically reaches Nothing added, but ongoing blower and energy cost At the plant, not upstream A treatment plant with the blower capacity and access aeration needs
Scrubbers and masking agents Chemical scrubbing media or fragrance After: treats the gas or the smell once it is in the air Spent scrubbing media or fragrance residue No An enclosed space where the air, not the water, is the problem
DRP Accelerator Usable oxygen for native bacteria Before: hydrogen sulfide is not formed Nothing; the accelerator is consumed as bacteria use it Yes, both A collection system or lagoon with a dosing point that can reach water and power upstream

No single row on this table is wrong for every site. A lift station with an active complaint today may still need an iron drum on order while a dosing point for the accelerator is surveyed. A plant with room in its aeration basins may only need help upstream, where blowers cannot go. Read the table for where each option sits, then read the page for the category closest to your problem.

Read the full comparisons

  • Bacteria additives: where an added culture helps, and where the native population already doing the work is enough on its own.
  • Enzyme products: what enzymes break down well, and why they do not touch the gas.
  • Iron salts: fast odor knockdown, and what has to be removed once the iron has done its job.
  • Nitrate products: another oxygen source ahead of formation, and what it adds to the water.
  • Aeration: where blowers do their best work, and why they cannot reach a force main.
  • Scrubbers and masking agents: treating the air instead of the water, and when that is the right target.

Named suppliers, one page each

The companies below add bacteria to wastewater, and each is an established supplier. Every page describes the company in its own terms, as its website puts it, says where that company is the better fit before saying where we are, and ends with the question to ask about your own system. Start with the side-by-side page if you want all of them at once.