That ph2o from the reservoirs runs through the metal tiles, and over time drops down to 23c. From that part of the loop, it then passes into the large cool h2o pool next to the reservoirs. It loops through there in a snake. This ensures that the pool stays ~24c even when we add warmer h2o to that pool.
The pool also has radiant *gas* pipes running through it, therefore ensuring that o2 production is *also* at ~24c.
For the moment, the loop is very small, it just drops down out of the cool h2o pool and returns to the reservoirs.
*But* that's why we have about 7 tons of ph2o in those reservoirs.
In phase 2 of the cooling rig, we will make those 7 tons run throughout the base and guarantee that *it* stays at about ~25c.
This is, admittedly, a tedious build. But it's not rocket science, needs no space materials, and will cool my base forever.