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Blue Prince / Pump room

Blue Prince pump room: drain the pool when a tank fills

Quick answer

Check Pool has water and T1 has room, return controls to neutral, then set P4 Up to move Pool → T1. When T1 is full, stop and free capacity through P1 or P2: use P1 Down to Aquarium/Greenhouse, or select T1 on P2 and use P2 Down to Fountain/Reservoir. Resume P4 after T1 has room.

Read the panel before moving a lever

Select the source shown on the panel, check that it contains water, and check that the destination has room. After every transfer, return the control to neutral before changing direction or switching P2 to another tank. The fixed connections are:

Pump control panel with six water-level bars and six source-selection buttons.
The Pump Room control panel shows water levels and source-selection buttons.GamesFuze · Blue Prince / Dogubomb / Raw FurySource
Pump Room port connections
PortConnectionDirection
P1Aquarium / Greenhouse ↔ T1Up or Down
P2Fountain / Reservoir ↔ selected T1 or T2Up or Down
P3Kitchen ↔ T2Up or Down
P4Pool ↔ T1Up or Down
Pump Room four route connections Each row is a bidirectional connection. P1 joins Aquarium or Greenhouse to Tank 1; P2 joins Fountain or Reservoir to the selected tank; P3 joins Kitchen to Tank 2; P4 joins Pool to Tank 1. PUMP ROUTESUP: source → tankDOWN: tank → source Aquarium /GreenhouseP1T1 Fountain /ReservoirP2T1T2P2 selector KitchenP3T2 PoolP4T1 P4 sits behind Tank 1.
Original route schematic: four separate reversible connections. The rear selector appears only on P2.

Drain the pool from the current state

Use the water bars as your state check. Water levels persist across days, so a fixed list of turns cannot cover every run.

Wide view of the Pump Room, with a control panel on the left and two tanks on the right.
The room brings together the wall panel, two tanks, and the connecting pipework.GamesFuze · Blue Prince / Dogubomb / Raw FurySource
  1. At P4, confirm that Pool has water and Tank 1 is below its four-unit capacity. Return the control to neutral, set P4 to Up, and run Pool → T1 until the pool is empty or T1 is full.
  2. If T1 fills first, return to neutral. With spare room in Aquarium or Greenhouse, use P1 Down to discharge T1 there. Otherwise set P2’s selector to T1 and use P2 Down to discharge T1 into a partly empty Fountain or Reservoir. Both the source and destination must satisfy the water and capacity checks.
  3. If that Fountain or Reservoir is already full, check T2. When T2 is full, keep the controls neutral and use P3 Down to an available Kitchen first; then switch P2 to T2 and use P2 Up to draw from the buffer. If T2 has room, switch P2 to T2 and use P2 Up.
  4. Switch P2 back to T1 and send T1 water into the room with capacity. Return to neutral, set P4 Up again, and continue draining the pool. Stop and reread the bars whenever a destination fills.

This route adapts to the rooms you have. It does not promise that every run needs the same transfers, and it never reverses a line while the control is still engaged.

Move water from T1 to T2

T1 cannot empty straight into T2. Use Fountain or Reservoir as a bridge: first put T1 water into that source, then change P2’s selector and draw the source into T2. Leave room in the receiving destination at each step.

Tank 1 to Tank 2 transfer through Fountain or Reservoir Water must move from Tank 1 to Fountain or Reservoir, then from that source into Tank 2; both links require spare capacity. T1 → T2 VIA BUFFER T1 Fountain /ReservoirCAPACITY T2 P2 switch: T1, then T2.
Tank 1 cannot pour straight into Tank 2. Use Fountain or Reservoir as a bridge, with room at every step.
  1. With water in T1 and capacity in Fountain or Reservoir, set P2 to T1 and choose Down.
  2. Return to neutral. Set P2 to T2 and choose Up, so the fountain or reservoir becomes the source and T2 receives the water.

Reserve water needs power

Basic pool drainage can run without boiler power, but Reserve access needs a powered route. Establish that prerequisite in the Boiler Room power route before diagnosing a reserve that stays unavailable. Completely emptying Reservoir also requires enough spare reserve capacity. Check the receiving capacity first; exact Reserve controls remain unverified for the current build.

Sources and scope

This route is cross-checked against Polygon, GamesFuze, TrueTrophies, and a Steam player discussion.

Checked 2026-09-09 against these published references. The route has not been tested in the current build.