With the latest update to Once Human, acid production has never been smoother—or more efficient. If you’re looking to create a fully automated acid farm that runs 24/7 and eliminates the need for manual actions, this guide is for you. The system detailed here outputs 576 units of acid per day, requires 162 watts of power, and can be saved as a blueprint for quick setup (except the water pumps, which must be reinstalled manually). Thanks to the updated mechanics allowing impure acid to flow through pipes, building an efficient, hands-off production line is now a straightforward task.

Overview of the Build

The updated system revolves around two large water filters (one for impure acid and one for pure water), 12 water pumps (10 for polluted water, 2 for dirty water), and two brewing barrels. Once configured correctly, the entire chain works automatically. You’ll only need to come back periodically to collect the finished acid from the tank. The design is neat, efficient, and can be optionally enhanced with visual cosmetics without affecting function.

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Updated Acid Production Math

Let’s break down how the numbers work under the new mechanics:

• Large Water Filter (Impure Acid):
  • Processes 2 units of polluted water into 1 unit of impure acid every 15 seconds.
  • That equates to 40 units of polluted water producing 20 units of impure acid every 5 minutes.
  • One water pump extracts 4 units of polluted water per 5 minutes → 10 pumps needed to meet demand.
• Brewing Barrels:
  • Convert 10 units of pure water + 10 units of impure acid into 1 unit of acid every 5 minutes.
  • To process the 20 units of impure acid, we need 2 brewing barrels.
• Large Water Filter (Pure Water):
  • Processes 2 units of dirty water into 1 unit of pure water every 15 seconds.
  • Produces 20 units of pure water in 5 minutes using 40 units of dirty water.
  • Two dirty water pumps are enough, each extracting 24 units of dirty water in 5 minutes.

Setup Instructions

Once all components are built and placed:

1. Assign 10 pumps to extract polluted water and 2 pumps to extract dirty water. You can now easily configure this using the updated pump settings menu.
2. Set one large water filter to produce impure acid and the other to produce pure water.
3. Ensure fluid routing via pipes connects the pumps to their respective water filters, and from filters to the brewing barrels.
4. Acid output flows directly into a storage tank for easy access.

Power and Control

The setup consumes 162 watts in total. You can use three dedicated power switches to control each component group:

• One for water pumps
• One for large water filters
• One for brewing barrels

However, switches are optional. The entire system is automatic, so once configured, you won’t need to turn things on or off manually unless you’re performing maintenance.

Blueprinting and Reinstallation

While you can save the entire structure as a blueprint for future use, water pumps are not included in the blueprint system. You’ll need to reinstall these manually, reconnect them with pipes and wires, and adjust their settings each time. The rest of the build, however, can be deployed instantly.

Optional Design Enhancements

If you want to give your acid farm a bit more style, cosmetic improvements can be added without altering the functionality. Decorative upgrades give your base a more refined and immersive appearance, especially if you’re setting up in a visible or community-shared area. The guide includes a basic structure suggestion for aesthetic improvements—totally optional, but nice to have.

Final Thoughts

This updated acid farm is highly efficient and incredibly low maintenance. With the new mechanics in place, it becomes a set-it-and-forget-it system, allowing you to focus your time on combat, exploration, or expansion. All you’ll need to do is swing by occasionally to collect acid from your storage tank.

Keep an eye out for upcoming blueprints, production calculators, and more build guides to take your game to the next level. For now, enjoy your fully automated acid production—no more manual drudgery required.