You can shift right click Mekanism machines while holding speed/energy/filter/etc upgrades to immediately install them. Other than that IIRC there’s no faster way of doing it. You could hide your fusion reactors or turbines in Hyperboxes or AE2 spatial storage to improve your FPS. Otherwise I’d just cut out the turbines and only use fusion reactors for energy since they’re a lot smaller and produce a lot more energy Answer from iSolaros on reddit.com
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Mekanism Wiki
wiki.aidancbrady.com › wiki › Heavy_Water
Heavy Water - Official Mekanism Wiki
Heavy Water (Deuteriumoxide, D2O) is an intermediate step in the production of Deuterium (a fuel for the Fusion Reactor).
Discussions

Electrolytic Separator won't accept heavy water.
Issue description I'm trying to make deuterium for my fission reactor, but my electorlytic separator will not accept the heavy water I need to pump into it in order to create it. Steps to repro... More on github.com
🌐 github.com
8
August 16, 2023
Electric Pump won't pump heavy water once it has 9010 mB of heavy water in it
Issue description Apparently an electric pump (with filter upgrade) won't pump heavy water once it reaches 9010 mB of heavy water in it. Pump won't pump the heavy water until the heavy wate... More on github.com
🌐 github.com
1
June 27, 2022
Can you change the heavy water pump rate of mekanism pumps?
I don't know if there's a config option, but I'm pretty sure you can use speed upgrades in the pump for a massive increase in rate. I don't remember ever needing more than a couple pumps for heavy water. More on reddit.com
🌐 r/feedthebeast
6
1
April 30, 2020
Mekanism heavy water issue?
kinda sounds like you are hitting the bug where mekanism recipes don't load correctly. running /reload command should fix it in that case More on reddit.com
🌐 r/Valhelsia
2
2
March 19, 2025
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Reddit
reddit.com › r/allthemods › [atm9tts] any better way to get heavy water and better energy generation ?
r/allthemods on Reddit: [ATM9TTS] Any better way to get Heavy water and better energy generation ?
August 19, 2024 -

I have built 4 Mekanism Fusion reactor but building more pump with filter upgrade is just too annoying so I'm looking for any alternatives to get heavy water. Building Gadgets mod doesn't copy inventory so I need to install filter upgrades manually, which is a pain. Also is there any turbine alternatives that consume steam for large amount of power ? I can just build more but my FPS already tank like crazy when I look in the direction of my turbines combined with the fact that they already have a huge impact of TPS.
At this point even a new mod or a config change will do, I have the resources to build new stacks of turbine and filter pumps but "horizontal" scaling isn't really my thing, especially with how manual it is with the pumps.

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YouTube
youtube.com › watch
Minecraft Mekanism 1.21.x how to get HEAVY WATER (EASY) - YouTube
FULL GUIDE about how to get heavy water in Mekanism latest versions from Udisen! ► Download mod https://udisen.com/mekanism/My Channels:► Text Tutorials → h...
Published   August 24, 2024
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Mekanism Wiki
wiki.aidancbrady.com › wiki › Electric_Pump
Electric Pump - Official Mekanism Wiki
If not collecting water, it will ... by default, but that can be configured. To collect heavy water, a Filter Upgrade must be installed into the pump, which allows the pump to collect heavy water from water....
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Feed The Beast Wiki
ftb.fandom.com › wiki › Electrolytic_Separator
Electrolytic Separator - Official Feed The Beast Wiki
The hydrogen is burned in a Gas-Burning Generator on the left. The Electrolytic Separator is used to separate Heavy Water into Deuterium and Oxygen, Brine into Sodium and Chlorine, and Water into Hydrogen and Oxygen.
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GitHub
github.com › mekanism › Mekanism › issues › 7845
Electrolytic Separator won't accept heavy water. · Issue #7845 · mekanism/Mekanism
August 16, 2023 - Issue description I'm trying to make deuterium for my fission reactor, but my electorlytic separator will not accept the heavy water I need to pump into it in order to create it. Steps to reproduce Pump out heavy water into a tank Try to...
Author   mekanism
Find elsewhere
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YouTube
youtube.com › watch
Heavy Water Mekanism Tutorial 1.16 English
Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube.
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GitHub
github.com › mekanism › Mekanism › issues › 7531
Electric Pump won't pump heavy water once it has 9010 mB of heavy water in it · Issue #7531 · mekanism/Mekanism
June 27, 2022 - Get an electric pump and place it down over a water source, power it and add filter upgrade to it. Wait until the pump has 9010 mB of heavy water in it.
Author   mekanism
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YouTube
youtube.com › themacksgaming
All The Mods Episode #22 Mekanism heavy water and deuterium set ups for 4X ore Processing - YouTube
We're backkkk. come check us out as we build the set ups needed for the reactor!!
Published   January 9, 2017
Views   668
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YouTube
youtube.com › xhedra gaming
Sky Capsule Project E21 - Mekanism - Heavy Water, Brine, HDPE and Salt + Creative Quests - YouTube
Hello everyone, xHedra here bringing you episode 21 of Sky Capsule Project, a modpack by TheMediocreModders. So in the last episode we finally started the E...
Published   March 11, 2023
Views   181
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YouTube
youtube.com › dadcraft73
OMOM Season 9: Mekanism! Episode 17: Heavy Water and the D-T Fuel Grind! - YouTube
Welcome to OMOM Season 9! Let's take a deep dive into the world of Mekanism! That's right! From 5x ore processing to a jet pack that lets us rule the skie...
Published   December 5, 2018
Views   484
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Feed The Beast Wiki
ftb.fandom.com › wiki › Deuterium
Deuterium - Official Feed The Beast Wiki - Fandom
June 7, 2025 - As added by Mekanism · Deuterium is the product of separating Heavy Water in an Electrolytic Separator. It's used in a Fusion Reactor with Tritium, and optionally, some D-T Fuel, to produce large amounts of energy, and if water-cooled, very ...
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Reddit
reddit.com › r/valhelsia › mekanism heavy water issue?
r/Valhelsia on Reddit: Mekanism heavy water issue?
March 19, 2025 -

Hi all,

I’m working my way through mekanism and I’m currently attempting to create deuterium by feeding heavy water into an electrolytic separator. Can pump the water fine but as soon as I feed it into a separator nothing happens it just stays in the pipe. All machine inputs are configured correctly and I’ve even tried dropping a fluid tank in the slot of the separator and it just pops in for a split second then pops back out. Has anyone encountered this before?

Playing on a multiplayer server if that’s any help.

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YouTube
youtube.com › watch
Minecraft - Sky Factory 4 - How to Make and Use an Electric Pump and How to Make Heavy Water - YouTube
In this Minecraft Sky Factory 4 tutorial I show how to make and use the Electric Pump which is part of the Mekanism mod. I also show how to use the pump to ...
Published   February 8, 2022
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YouTube
youtube.com › watch
Sky Bees 2 E26 Mekanism Heavy Water Fuels and Killing ...
Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube.
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YouTube
youtube.com › watch
Heavy Water Mekanism Tutorial 1.16 Deutsch / German
Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube.