Something is Living in my Pool-Cooled Gaming PC

Quick Overview

The attempt to use pool water to cool a high-performance server rack failed catastrophically due to corrosion caused by the pool's chemical composition, necessitating a complete shutdown, disassembly, cleaning of the heavily corroded water blocks, replacement of filters, and a re-evaluation of the cooling loop's fluid choice to prevent future biological growth and corrosion.

Key Points: The initial pool water cooling attempt resulted in severe corrosion, evidenced by green/yellowish buildup and gunk inside the CPU and GPU water blocks. The corrosion was identified as copper corrosion, likely caused by the pool's chemical additives, which were not suitable for the cooling loop. The team had to completely drain the system, remove all computers from the rack, and clean the components, including scrubbing the water blocks with a toothbrush. The corroded CPU block showed significant buildup, while the GPU block from another system was even worse, revealing copper corrosion. The team discovered the pool water lacked essential biocides/antimicrobials, leading to organic growth (slime/gunk) in the system, particularly visible in the reservoirs. The UV sterilizer, intended to kill microbes, was only effective against UV-C light, which was not what the current setup was emitting, highlighting a mismatch in protective measures. The final plan involved replacing the corroded components, installing new 10-micron filters, and using proper coolant additives (like silver coils) to prevent future issues.

Context: This video follows up on a previous ambitious project where the creators decided to cool their entire home server room using a pool as the ultimate heat sink. After initially running the system, they encountered significant problems related to the pool water being used as the coolant, specifically corrosion and biological growth within the water blocks and filters, prompting a major teardown and cleaning operation.

Detailed Analysis

The video documents the aftermath and repair process following the decision to use pool water to cool a server rack system. The initial test resulted in significant corrosion and organic buildup, forcing a complete system shutdown. The team disassembled the liquid-cooled components, revealing severe damage; the CPU block showed green/yellow corrosion, and the GPU block was even worse, exhibiting heavy copper corrosion. They also found slime/gunk in the reservoirs, indicating biological growth due to the lack of proper biocides in the pool water. The initial plan to use a UV sterilizer was found to be inadequate as the light spectrum used was not sufficient to kill all pathogens. The repair involved draining the entire system, cleaning all water blocks, replacing heavily fouled 10-micron filters with new ones, and reassembling with proper coolant, including an antimicrobial silver coil. The host noted that the flow paths in one of the water blocks were installed incorrectly (inlet/outlet reversed from the optimal configuration), which may have contributed to the issue, but the primary failure was the corrosive nature of the pool water itself.