Up ahead, the walls will break apart and some conversion gel will splash around. Put a portal on the conversion gel on the floor near you, then put a portal of the other color on the conversion gel above the door across the gap. Go through. Then go through the door behind you.

There are some turrets behind glass to the right. There's a light funnel near where the Wheatley monitor is, and past that there is a blue gel tube that is not currently turned on. There is a button near the blue gel tube that can turn it on.

Put a portal on the wall below the blue gel tube, then put a portal of the other color on the floor. Drop in. From this area, put a portal on the wall that the funnel is shining onto, then put a portal on the wall below the blue gel tube. The funnel should be going toward the door that you came into the chamber from. Press the small red button to make the gel come out for a limited amount of time. When the gel is over the edge of the ledge, move a portal so the funnel stops holding the gel. This will make some blue gel fall on the edge of the ledge so that you can bounce from it.

Now put a portal under the gel tube again to make the funnel come out from there. Press the red button once more, then bounce on the blue gel to get up into the funnel. You and the gel will start flowing toward the entrance to the room.

Get out of the funnel when you can safely do so, then quickly stand on the big red button. The gel will start going back toward the portal. Let it go through the portal so that it's going toward the funnel generator. Quickly put a portal on a wall above the turrets, making sure that the funnel comes out of that new portal. Now step off of the big red button. The blue gel should now flow above the turrets. Move the portal to make the gel fall onto the platform that the turrets are standing on. This will make them all bounce, deactivating them.

Now go to the button that the turrets were guarding. Press it. This reveals an angled white wall. Put a portal on the wall where the funnel is shining, then stand on a white floor and put a portal of the other color under you. Wait until you reach the ceiling. Now put a portal of the other color (not the floor portal color) on the angled wall. You should fall into the floor portal, out of the angled wall portal, and bounce on the blue gel that disabled the turrets, reaching the exit door after.