Oxygen Not Included is about more than just managing your duplicant’s oxygen supply, efficiently managing polluted water will ensure that you won’t need to worry about your duplicants getting hungry or too dirty. Polluted water ruins all of your dreams.

Water Storage in Oxygen Not Included

It’s generally a good idea to plan out and dedicate an area of your base to be used for water storage. Both of these tanks can either be placed horizontally or vertically, they don’t even need to be next to each other but having them near one another does make everything a lot easier.

Oxygen Not Included Water Tanks
Basic Water Tanks in Oxygen Not Included

On the other hand, there’s still plenty of things wrong with this build. You can’t bottle the clean water unless you open up the top and use a water bottler, and you can’t exactly use this build for the rest of your game for a couple of reasons, we’ll get to those later.

Basic Water Purification

This is the basic setup for water purification that people use in the early game. Yours might be different, or you may plan for the future and use larger tanks.

Oxygen deodorizers

The reason I’m using those oxygen deodorizers over there is because polluted water produces polluted oxygen, the deodorizers help with cleaning it up.

You can easily get away with only a couple of them, no need for four.

Food poisoning

This is a major concern for most players at the start of the game, germs will go through the water sieve and your clean water will contain food poisoning germs. So it’s a good idea to plan for the future.

If you use polluted clean water for food preparation, your dupes will get food poisoning.

Removing food poisoning germs

Liquid Tepidizers can be used to heat up the water – killing food poisoning germs as well as slimelung. But keep in mind that you’re creating heat and will eventually need to figure out a cooling system for your base.


Just in case you weren’t sure about how the pipes are connected, here’s a screenshot.

The clean water can be used for showers and lavatories. You might want to use a Tepidizer before using this clean water to cook anything!

Plumbing connection for a basic water tank in Oxygen Not Included

Bottle Emptier

Yes, you can place a bottle emptier on top of those mesh tiles to let your dupes empty bottled polluted water. It’s generally a good idea to set that in the early game because polluted water bottles will slowly pollute the oxygen around them.

That will also let you collect all the polluted water from Algae Terrariums. You shouldn’t be using those in the first place, we do have a detailed post covering why they’re not a good idea.

Food Production

It’s generally a good idea to keep using your starting water reserves for any and all food production. There’s no need to move all the water over to your base! Unless you wish to have three different tanks, one for polluted, one for clean with germs, and one for perfectly clean water, free of all germs.

Temperature Management

The reason I’m not recommending using a Tepidizer from the start is because heat is your ultimate enemy. If your base heats up too fast then you won’t be able to farm anymore. It’s generally a good idea to replace your water reservoir’s walls with a much more insulating material before you start any water purification plans.

It’s also a good idea to keep your farming area as far away from your water reservoirs as possible.


  • Was there an update that changed something we talked about?
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