The cooler system is in two steps. The first is a pre cooler. It is a 2.5 meter copper pipe surrounded by a large silicone hose. I'm flushing the hose with cold water.
In the picture below, you can see the gray water pipe from the boiler connected to the copper pipe. I have another hose connected to the cooler hose to avoid flooding down the stairs.
At the bottom of the pre cooler is a similar connection with cooling water connected to the cooler hose and a transparent hose connecting to the copper pipe and the main cooler coil. If you look closer, you can see brownish brew going through the small hose. (That brew will be at May crown. More about that later... :)
The cooler coil is submerged in a large barrel. It is quite thin and this slows down the flow enough to bring down the temperature to about 30 degrees Celsius. This system seems to be enough to force a quick cooling and get a cool break to make the beer reasonable clear.
The brew is clear enough so I can see through the hose.