Corrosive Sludge Pump

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Icons Campaign.png Unlocked through an assignment
Requires Driller Level 18
Purchased for:
Credit.png 8200 Credits
Jadiz 50 Jadiz
Magnite 110 Magnite
Enor Pearl 40 Enor Pearl

The Corrosive Sludge Pump is what happens when the maintenance staff are left with too much time on their hands. A complicated network of piping, distillation bottles, and safety valves results in a very capable device indeed - lobbing globs of toxic waste at those you disapprove of has never been so fun!

— Item Description

The Corrosive Sludge Pump is an unlockable primary weapon for the Driller. It is a large sludge dispenser that fires corrosive sludge, capable of melting enemies. It consists of a number of pipes and valves wrapped around a fuel tank with a nozzle.

The Sludge Pump has two firing modes; Tapping the fire button will fire a single fragment of sludge whereas holding the fire button and releasing will fire a sludge bomb that causes several fragments to fly out upon impact.

When a corrosive projectile impacts an enemy, that enemy becomes visibly coated with sludge and takes damage over time (DoT). When the projectile impacts a surface, it creates a corrosive puddle that causes DoT to any enemy walking over it, along with slowing them down.


There are five tiers of modifications and each tier has two to three upgrades. Only one modification can be equipped per tier.

Corrosive Sludge Pump Modifications
Mod Effect In Game Description Price
Tier 1 Icon Upgrade ClipSize.png
High Capacity Tanks
+20 Tank Size "The good thing about clips, magazines, ammo drums, fuel tanks can always get bigger variants."
Credit.png 1200 Credits
Bismor 25 Bismor
Icon Upgrade ProjectileSpeed.png
Better Air Pressurizer
+40% Projectile Velocity "The air pressurizer is improved, making the projectiles travel faster and further."
Credit.png 1200 Credits
Croppa 25 Croppa
Icon Upgrade Area.png
Air Sensitive Compound
+ Bigger Puddles

(x1.25 Puddle Size)

"When the goo is exposed to air it expands, making puddles cover a larger area on impact."
Credit.png 1200 Credits
Umanite 25 Umanite
Tier 2
Level 4
Icon Upgrade Area Damage.png
Dyse Nozzle
+24 Charged Splash Damage "With the Dyse Nozzle your charged shot is launched with more force, making it damaging on impact."
Credit.png 2000 Credits
Umanite 15 Umanite
Bismor 24 Bismor
Icon Upgrade Area.png
Atomizer Nozzle
+4 Charged Fragment Count "With the Atomizer Nozzle your charged shot will leave behind more fragments on impact."
Credit.png 2000 Credits
Jadiz 24 Jadiz
Bismor 15 Bismor
Icon Upgrade DamageGeneral.png
Potent Goo Mix
+8 Normal Shot Damage "Normal shots do more damage on impact."
Credit.png 2800 Credits
Croppa 50 Croppa
Umanite 35 Umanite
Tier 3
Level 8
Icon Upgrade Duration V2.png
+2 Effects Duration, +6 Puddle Lifespan "The goo goes through a process of supersaturation after impact, making the effects and puddles last longer."
Credit.png 2800 Credits
Magnite 50 Magnite
Umanite 35 Umanite
Icon Upgrade Ammo.png
More Goo Canisters
+40 Max Ammo "You had to give up some sandwich-storage, but your total ammo capacity is increased!"
Credit.png 2800 Credits
Enor Pearl 35 Enor Pearl
Bismor 50 Bismor
Tier 4
Level 12
Icon Upgrade Fuel.png
Spillback Extension
-1 Charge Cost "With the Spillback Extension added to the nozzle you spend less goo when charging."
Credit.png 4800 Credits
Magnite 50 Magnite
Umanite 72 Umanite
Bismor 48 Bismor
Icon Upgrade ChargeUp.png
Improved Spooling Mechanism
-60% Charge Time "The spooling mechanism has been improved and can get you to a full charge faster!"
Credit.png 4800 Credits
Croppa 48 Croppa
Jadiz 50 Jadiz
Umanite 72 Umanite
Tier 5
Level 16
Icon Upgrade MovementSpeed.png
Protein Disruption Mix
+ Increased Slowdown Effect

(x0.75 Movement Speed for Direct DoT Effect, x0.5 Movement Speed for Puddles)

"Disrupting the protein molecules in the goo mix has made it more rigid and harder for creatures to move through."
Credit.png 5600 Credits
Magnite 140 Magnite
Umanite 64 Umanite
Bismor 70 Bismor
Icon Upgrade Acid.png
Fluoroantimonic Acid
+ Increased Corrosive Damage per sec.

(+2 Effect Damage (per tick), +4 Puddle DPS)

"A new and improved goo recipe with very aggressive properties makes every second in it more hellish!"
Credit.png 5600 Credits
Croppa 70 Croppa
Umanite 64 Umanite
Enor Pearl 140 Enor Pearl


Overclock calculations happen after modifiers.

Sludge pump.png Corrosive Sludge Pump [Expand/Collapse]
Overclock Effect In Game Description Price
Hydrogen Ion Additive
Frame Overclock Clean.png
Icon Upgrade Acid.png
Pos.svg +0.5 Direct Hit Corrosive Damage

Pos.svg x0.85 Direct Hit Corrosive Slowdown

"Experimental additive that activates on impact gives a small improvement to the corrosive DoT and slowdown effect of direct hits."
Credit.png 8800 Credits
Umanite 70 Umanite
Enor Pearl 100 Enor Pearl
Bismor 135 Bismor
AG Mixture
Frame Overclock Clean.png
Icon Upgrade ProjectileSpeed.png

Pos.svg +30% Projectile Velocity
Pos.svg x0.25 Gravity on Projectiles

"Anti-gravity pellets suspended in the sludge let the projectiles fly further and faster."
Credit.png 7800 Credits
Croppa 60 Croppa
Jadiz 105 Jadiz
Umanite 140 Umanite
Volatile Impact Mixture
Frame Overclock Balanced.png
Icon Upgrade DamageGeneral.png

Pos.svg 2x Regular Shot Area Damage
Pos.svg 2x Charged Shot Area Damage
Neg.svg x0.5 Corrosive DoT Duration
Neg.svg x0.75 Sludge Puddle Duration

"Special mixture greatly increases immediate projectile damage. However the volatile compound evaporates quicker, reducing the duration of the corrosive and slowdown effects as well as the puddle lifetime."
Credit.png 8500 Credits
Jadiz 75 Jadiz
Magnite 100 Magnite
Bismor 120 Bismor
Disperser Compound
Frame Overclock Balanced.png
Icon Upgrade Area Damage.png

Pos.svg +6 Charged Shot Fragments
Pos.svg +4 Fragment Area Damage
Neg.svg -24 Charged Shot Area Damage

"Charged shots break apart into more fragments on impact and each fragment is more potent, however the initial damage of the charged projectile impact is reduced."
Credit.png 8800 Credits
Jadiz 135 Jadiz
Magnite 100 Magnite
Umanite 60 Umanite
Combustive Goo Mix
Frame Overclock Balanced.png
Icon Upgrade Explosion.png

Pos.svg Gooed enemies and puddles explode when ignited
Pos.svg Burning enemies explode when gooed.
Neg.svg +2 Charged Shot Cost
Neg.svg Burning enemies are doused after explosion

"Adding ammonium nitrate to the sludge mixture makes it explode when exposed to high temperatures. This new sludge mix has a thinner consistency, increasing the ammo cost of the pump's charged shot. It also smells even worse."
Credit.png 8950 Credits
Umanite 105 Umanite
Enor Pearl 60 Enor Pearl
Bismor 135 Bismor
Goo Bomber Special
Frame Overclock Unstable.png
Icon Upgrade Special.png

Pos.svg Charged projectile drops fragments as it flies
Pos.svg +4 Fragment Area Damage
Pos.svg x1.5 Charged Shot Fragments
Pos.svg x1.33 Sludge Puddle Duration
Neg.svg Charged projectile does not break into fragments on impact

"The addition of finely tuned timed separation compounds cause the charged shots to leave a trail of sludge as they fly through the air. However the projectile depletes its mass as it flies, dealing less impact damage as fragments separate and completely expiring once all fragments are dropped."
Credit.png 7450 Credits
Jadiz 140 Jadiz
Umanite 65 Umanite
Enor Pearl 90 Enor Pearl
Sludge Blast
Frame Overclock Unstable.png
Icon Upgrade Shotgun Blast.png

Pos.svg +Sludge Blast
Pos.svg +100% Charged Shot Velocity
Neg.svg x0.5 Charged Shot Area Damage
Neg.svg -40 Max Ammo
Neg.svg +0.6 Reload Time

"The charged shot cohesion is disrupted on firing, instantly shooting out fast-moving fragments in a shotgun-like blast. While spectacular the modifications result in reduced ammo capacity and an extended reload process."
Credit.png 8200 Credits
Jadiz 100 Jadiz
Magnite 120 Magnite
Umanite 60 Umanite

Stats Breakdown

Understanding the Weapon

  • Damage is how much damage is dealt upon direct impact of an uncharged shot.
  • Charged Area Damage is how much damage is dealt within the damage radius around the impact of a charged shot.
  • Charged Fragment Damage is how much damage is dealt by each fragment spawned by a charged shot.
  • Charged Fragment Count is the amount of fragments spawned by a charged shot.
  • Effects Duration is the amount of time in seconds that corrosion affects an enemy when it is directly impacted by a corrosive projectile
  • Puddle Lifespan is the amount of time in seconds that a corrosive puddle persists after a corrosive projectile lands on surface

Normal and Charged Shot Breakdown

Normal Shots & Charged Fragments

  • Damage Type: 50% Kinetic / 50% Corrosive
  • Damage Radius: 1m
  • Max Damage Radius: 0.5m
  • Minimum Damage: 25%
  • Hitbox Radius: 0.25m (0.20m for Fragments)

Charged Shots

  • Damage Type: 50% Kinetic / 50% Corrosive
  • Damage Radius: 2.5m
  • Max Damage Radius: 1m
  • Minimum Damage: 25%
  • Hitbox Radius: 0.45m

Corrosion Mechanics

Enemies hit directly or caught within the splash radius of the sludge projectiles have a 100% chance to be applied with Corrosion. (Note: Enemies walking through a corrosive puddle will not apply/refresh this effect.)

  • Damage (per tick): 8
  • Damage Type: 100% Corrosive
  • Tick interval: 0.2-0.25s
  • Duration: 4 seconds
  • Slowdown: 35% (x0.65 Movement Speed)

Puddle Properties

Enemies take damage for however long they remain on a corrosive puddle. (Note: This DoT stacks with the aforementioned Corrosion DoT effect.)

  • Damage (per tick): 4
  • Damage Type: 100% Corrosive
  • Tick interval: 0.2-0.3s
  • Duration: 12 seconds
  • Slowdown: 45% (x0.55 Movement Speed)
  • Hydrogen Ion Additive Overclock does not affect the puddle damage or corrosive puddle DoT or Slowdown
  • Puddle Diameter is affected by whether the puddle was created by a normal shot or a charged shot. Charged fragments create the same size puddles as normal shots
    • Normal diameter: 1.2 meters
    • Charged diameter: 2.4 meters
  • Puddles ignite after accumulating 20 Heat from any source. While burning the puddles deal additional Fire + Heat damage to enemies that walk through them
    • Additional Damage (per tick): 12 Fire
    • Heat (per tick): 12 Heat
    • Tick Interval: 0.5-1.0s

In addition to the applying a damage over time that deals both Fire and Heat damage the Burning Goo Puddles are considered to be On Fire with a 1.7m Area Heat Radius. Along with this the Burning Goo Puddles act as an Environmental Heat Source with an Intensity value of 1. To calculate the total heat being applied to any given bug simply use this formula:

Most of the time the amount of additional Heat damage will simply be 2 + 5 * [ Nearby Puddles ]. The Heat Intensity can be raised or lowered in the presence of other Environmental Heat or Cooling effects such as the Blizzards that may occur in the Glacial Strata.

Slowdown Mechanics

The two modifications, Protein Disruption Mix and Hydrogen Ion Additive, that affect the Sludge Pump's two sources of slowdown do not add to or replace the slowdown stats. Instead they act as separate multipliers to enemy movement speed.

Movement Speed Multiplier Values
Modifications Corrosion Status Effect Corrosive Puddle Corrosion + Puddle
Base x0.65 x0.55 x0.3575
Protein Disruption Mix x0.4875 x0.275 x0.1341
Hydrogen Ion Additive x0.5525 x0.55 x0.3039
PDM + HIA x0.4144 x0.275 x0.1140

Unique Modifications

Unique Modifications
Icon Upgrade Acid.png
Fluroantimonic Acid
Fluoroantimonic Acid increases the damage of both the Corrosion status effect and the Corrosive Puddles. The extra damage added to the puddles comes in the form of a second damage over time effect with its own tick rate and damage.

Corrosion Bonus:

  • +2 Corrosive damage per tick.

Second Puddle DoT:

  • Damage (per tick): 1 Corrosive damage
  • Tick Rate: 0.2-0.3s

Unique Overclocks

Unique Overclocks
Frame Overclock Unstable.png
Icon Upgrade Special.png

Goo Bomber Special

Goo Bomber Special is an unstable overclock that causes Charged Shots to drop their Fragments straight down while flying, instead of upon impact. Every Fragment dropped reduces the damage of the main projectile. After every Fragment has been dropped / collide with an entity or the terrain, the main projectile is instantly destroyed.

Frame Overclock Unstable.png
Icon Upgrade Shotgun Blast.png

Sludge Blast

Sludge Blast is an overclock that changes the Charged Shot into a shotgun-like blast of the Fragments instead of a larger projectile. Fragments use the Charged Shot's damage instead. Charge Shots are also launched at a 3° angle instead of the normal 9° angle.


Each modification that is purchased advances a mastery bar by one unit.

Mastery unlocks:

  • Three modifications – First Stripe Weapon Paintjob Icon Skin First Stripe.png
  • Seven modifications – Deepcore Weapon Paintjob Icon Skin Deepcore.png
  • All modifications – The Company Special Weapon Paintjob Icon Skin The Company Special.png


Full gallery of skins can be seen at Weapon Skins.



  • The Corrosive Sludge Pump's weapon prototype used the Platform Gun model and its goo blobs more closely resembled the goo generated by Goo Sacks.
  • One of the weapon's upgrades is named "Fluoroantimonic acid." This substance currently holds the title of the worlds most potent superacid.[1]
This page is possibly not up to date. It was last updated for Season 01: Rival Incursion
Updated for U35