The frequency with which you need to change the liquid in your water cooled PC depends on a few factors, including the type of cooling system you have, the environment in which your PC is located, and how often you use your PC.

* **All-in-one (AIO) liquid coolers** are typically sealed systems that do not require any maintenance, including changing the liquid. However, some AIO coolers are designed to be user-refillable, and you may need to do this every few years if the liquid level drops too low.
* **Custom liquid cooling systems** are more complex and require more maintenance. You should typically change the liquid in these systems every 1-2 years, or sooner if the liquid becomes discolored or cloudy.

Here are some other factors to consider when determining how often to change the liquid in your water cooled PC:

* **The environment in which your PC is located:** If your PC is located in a dusty or dirty environment, you may need to change the liquid more often to prevent the buildup of debris.
* **How often you use your PC:** If you use your PC heavily, you may need to change the liquid more often to prevent it from becoming contaminated.

If you are unsure how often to change the liquid in your water cooled PC, you should consult the manufacturer's instructions.

Here are some tips for changing the liquid in your water cooled PC:

* **Make sure the PC is turned off and unplugged before you start.**
* **Drain the old liquid into a container.**
* **Clean the cooling blocks and tubing with a mild detergent and water.**
* **Refill the system with new liquid.**
* **Purge the air from the system.**

Changing the liquid in your water cooled PC is a relatively simple process, but it is important to follow the manufacturer's instructions carefully to avoid damaging your PC.
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