The ultimate Once Human Acid farm guide

In Once Human, Acid is an important resource as it is used in a lot of crafting recipes and one of the more predominant materials involved in crafting specialty Ammunition that can deal with end-game bosses. We’ve put together the best Once Human Acid Farms so you can get as much of it as you may need for crafting.

How to farm Acid in Once Human

There are multiple ways to farm acid in Once Human, both actively and passively. As you might expect, active farms will get you acid faster, but won’t be as effective in the long run. Passive methods will be slower, but will add up quickly and could get you all the Acid you could ever need.

So let’s take a look at all the ways you can farm Acid, starting with the active methods.

The best active Acid farms in Once Human

Method 1: Refineries

Using this method, you could collect upwards of 1,000 Acid per hour, but it is a bit of a grind. This method involves using one of the game’s many refineries. The first thing to do if you’re going to grind refineries is to make Deviated Chops, which helps boost the Acid drop rate.

You can craft Preserved Deviated Chops on an Electric Stove or Kitchen Set, and you’ll need one of any meat, one peppercorn, and two salt.

Now you’ll want to find a refinery. My favorite one is at the Blackfell Oil Fields, which can be found by looking for the refinery icon, as depicted below.

Walk up to the production facilities, interact, choose the card you want, and start the defense. Be warned, however, that the level 45 monsters can be quite challenging.

If you don’t have a strong build, be sure to enter build mode and block all the entrances before you rush the start of the defense.

In just one run, I managed to get over 200 Acid, and an average run takes about 7 minutes in total to complete. This means that you can easily get more than 1,000 Acid per hour, or even per half-hour if you’re lucky — all while your passive Acid farm is generating even more back at home.

Keep in mind that the majority of your Acid comes from the mobs you defeat, so be sure to pick up all the loot as you go.

Method 2: Deviant Locations (if Refineries are too difficult)

This method will also start with you making and consuming Deviated Chops. All active Acid farms in Once Human will start with these chops, so keep this in mind.

For this method, you’ll need the highest level area that has the Deviant enemy type that you can find. So head to an area like Ashenton in the Way of Winter, or Blackfell in the Manibus scenario, and circle the city, killing all the Deviants you see. Make sure to grab the loot they leave behind, as this is how you’ll be gaining Acid.

Both these cities can only be accessed in Phase 2, I should add.

But what’s better than farming a ton of Acid while fighting Deviants? That’s right; you can farm acid even while you sleep. Let’s move on to the passive farming methods.

Method 3: Sulfur Chemist / Art of Stardust Decay (Semi-passive)

Sulfur Chemist, a Memetic Specialization, used to be completely overpowered back in Beta. The formula was simple — turn Sulfur into Acid at a Synthesis Bench. With the full release of Once Human, you also now have to add Energy Links (EL) to the equation.

You’ll need to spend about 5,000 EL for a stack of 100 Acid now, plus the sulfur you’ll need. Luckily Sulfur is about the easiest thing to farm in Once Human, so that’s no issue. EL isn’t exactly hard to get either, and you’ll be able to sell some of your Acid for a profit. You can easily make around 600 Acid per day with this method, mostly passively. The only active thing you’ll need to do is farm the Sulfur.

Another Memetic Specialization is Art of Stardust Decay, which can net you even more Acid by burning Stardust Source in an Electric Furnace. Again the process itself is mostly passive, however, you’ll need to actively farm for Stardust Source or set up processing facilities — either way, there are better methods out there.

You can easily make tons of Acid if you have a Super Refinery and plenty of Stardust Ore to feed your furnaces, but there are alternative ways if you can’t get all of these Memetic Specializations on a single character. 2

The truth is you don’t need the specializations, as the following passive methods will help you you farm all the Acid you need for your personal use.

Best Passive Once Human Acid farms

Method 1: Pollution Zone farm

The best Once Human Acid farm involves setting up a passive farm at your base that will automatically generate Acid for you to use. Primarily using Water Pumps, this passive farm can generate 288 Acid per day for a mere 108 Watts of power.

It’s important to note that Acid can only be created in polluted areas, so make sure you are in one when setting up the passive Acid farm. If you see a number fluctuating on your character’s back, you are in a polluted area. Here’s what you’re going to need to build this passive Acid farm in Once Human:

• 10 Water Pumps
• 1 Osmosis Water Purifier
• 1 Fermentation Barrel
• 108 Watts of Power
• Build in a Pollution Zone

Build the most advanced generators that you can, with Deviation Energy Generators offering the most power output. If you have a specialization for the other generators, they may prove more efficient. You can unlock these generators in the Logistics branch in your memetics screen.

Next, construct your 10 Water Pumps, which are also found under Logistics (in 03) in your Memetics screen. Make sure you raise the elevation using Alt and the scroll wheel when placing the Water Pumps so that water can flow downwards to your filters. Each Water Pump you build requires the following materials:

• 25 Steel Ingot
• 20 Carbon Fiber Fabric
• 20 Refined Parts
• 20 Standard Parts
• 20 Electronic Accessory
• 10 Watts of Power

Make sure all the Water Pumps are dumping into Water Storage Containers. From here, connect the other side of the Water Containers to an Osmosis Water Purifier. The Osmosis Water Purifier will convert the Polluted Water into Impure Acid.

You’ll have to manually collect the Impure Acid out of the Water Purifier, which you then place into a Brewing Barrel. A completely filled Brewing Barrel will generate 4 Acid every 20 minutes, making this passive base the best Once Human Acid farm!

Method 2: Corrupted plants

Within pollution zones, you can find contaminated plants. These can also be refined in a Brewing Barrel and be made directly into Acid (without having to go through a Water Purifier). However, to be efficient with this method, you’ll need to find seeds and plant these crops.

This means irrigating them, ensuring they have enough light and harvesting and replanting them (unless you have a Growshroom). However, this method isn’t quite as effective as our first method.

Method 1 remains the best passive Acid farm in Once Human.

Method 3: Thermal Towers Acid Farm

The Way of Winter Scenario has given us one more method with which to farm Acid — by simply building and upgrading a Thermal Tower. You can unlock the Thermal Tower under the Building tab in 04 in your Memetics Screen. It costs 2000 Energy Links and 7 Ciphers to unlock.

You’ll then have to build one on a neighboring plot to your house, and building it will require the following.

• 35 Aluminium Ingots
• 50 Steel Ingots
• 30 Metal Scraps
• 30 Electronic Parts
• 10 Storage Batteries

Once done, you’ll need to begin upgrading it. The first few tiers won’t cost too much and only take five minutes. Once you can build from the second tier, Thermostatic Cover, you’ll be able to choose Chaosium Chemistry, after which your tower will produce 50 Acid every day.

That doesn’t sound like much, but our level 28 tower is producing about double that, somehow. At around 1200 Acid per day, you won’t be needing Acid for much longer.

Which Acid farm is best?

The best Acid farm in Once Human will depend on your needs. Do you require Acid urgently? Farm refineries. Do you just want to make sure you never run out? Set up the passive methods.

Of the passive Acid farms, it’s hard to beat the Thermal Tower. It can create more Acid than you can reasonably use in a season. If you’re not in winter, your next best option is one of the semi-passive memetics.

If you don’t have access to a Thermal Tower or to the Memetic Specializations, you’ll have to set up a passive Acid farm and run a few Refineries. This should tide you over for the season.

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