Clean up Amoeboids in Pumping Station is an optional mission in Ratchet & Clank (2016 game) taking place in Jowai Resort on planet Pokitaru. After Ratchet and Clank destroyed the hydroharvesters, Al granted Clank a Thrusterpack, allowing them to turn the special bolt crank access the Blarg Pumping Station.
To reach the Pumping Station, from where your ship lands, head to the right instead of down the stairs to the left during the previous path, to find a special bolt crank, appearing different from the others. Attach to it, and with the Thrusterpack, you will be able to turn it, disabling the security barrier that blocks entrance to the Pumping Station. With this disabled, head to the dark blue building with an entrance in the water that has a green light over it and teleport to the Pumping Station.
Inside here, you will find the area flooded. Swim in the puddle and head to the right to find a level above with an amoeboid and a plug for your Hydrodisplacer. Defeat the amoeboid and connect the hydrodisplacer to drain the flood. Head down through here and an Invinco-Lock will lock the next door proceeding inwards. Unlock it with the Trespasser, kill the sharkigator here, then head back to the Hydrodisplacer plug and fill the water again. This will allow you to swim back and head up to the upper level, signified by amoeboid slime.
Up here, you will find a large group of amoeboids and a special bolt crank in the middle. Defeat the amoeboids, using weapons such as the Pixelizer or Proton Drum to knock them back, then turn the bolt crank. This will cause moving platforms around this room to appear. Climb up the platforms to reach the top of the room with another Invinco-Lock, and use the Trespasser to unlock it. This leads to a large, flooded area, with several exploding and metal crates. Touch a few crates to cause them to explode and collect bolts, but make sure not to stay under water too long.
Eventually, swimming through will lead to another area full of amoeboids. Jump up and fight the amoeboids here and reach another bolt crank. Turn the bolt crank to deactivate the forcefield in front, and you will reach an O2 Mask.
Before leaving the planet, the mission "Find a way to the top of the waterfall" can still be completed here. With the O2 Mask, you can also explore sunken treasure and more easily obtain gold bolts here.