Several signs or indicators might suggest that it's time to change the liquid in a custom liquid cooling system of a water-cooled PC. Regular maintenance and monitoring are crucial to ensure the cooling system's optimal performance and prevent potential damage. Here are some common signs that might indicate it's time for a liquid change:

1. Discoloration: If the liquid in the cooling system becomes discolored or murky, it is a clear sign that it may be contaminated or breaking down over time. The liquid should ideally remain clear and transparent.

2. Cloudiness or Sediment: If you notice cloudiness or sediment particles in the liquid, it could indicate the presence of debris or contaminants. This can impede the cooling system's efficiency and may lead to clogging.

3. Reduced Cooling Performance: Over time, the cooling efficiency of the system may decrease due to air pockets, corrosion, or the breakdown of the coolant. If you observe higher CPU or GPU temperatures than usual, it might be time to check the cooling system.

4. Noisy Pump or Increased Vibration: If the pump in your liquid cooling system starts making unusual noises or the system experiences increased vibration, it could be due to air bubbles or impurities circulating in the liquid.

5. Evaporation Loss: Over time, some liquid may evaporate from the system, resulting in a decrease in coolant levels. If you find that you need to top up the coolant more frequently, it could indicate a need for a liquid change.

6. Corrosion or Rust: Inspect the cooling components for signs of corrosion or rust. Corroded parts can lead to leaks and compromise the cooling system's effectiveness.

7. Extended Usage Period: As a general guideline, custom liquid cooling systems may require a liquid change every 1-2 years, depending on usage and the type of coolant used. If your system has been running for a long time without a liquid change, it's a good idea to consider performing maintenance.

8. Preventive Maintenance: Sometimes, it's best to schedule regular liquid changes as part of a preventive maintenance routine to ensure the system's longevity and efficient cooling.

Proper maintenance and timely liquid changes will help keep your water-cooled PC running optimally and protect your investment in high-performance cooling.
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