The frequency of changing the water in a pressure washer depends on the type of pressure washer you are using. There are two common types of pressure washers: gas-powered and electric-powered.
Gas-powered pressure washer: Gas-powered pressure washers use water from a connected hose, and there's usually no need to change the water as it continually draws water from the hose as needed. However, it's essential to ensure the water supply is clean and free from debris that could clog the pressure washer's inlet or nozzle.
Electric-powered pressure washer: Electric pressure washers typically have an integrated water tank or can be connected to a separate water source. If your electric pressure washer has a built-in tank, you'll need to change the water whenever it becomes dirty or contaminated. This could vary depending on how frequently you use the pressure washer and the quality of the water you're using. If you're using a separate water source, such as a bucket, you should change the water whenever it becomes dirty or if you're switching to a different cleaning solution.
In general, it's a good practice to inspect the water supply before using a pressure washer and make sure it's free from debris or contaminants. If you notice any issues with the water, such as a decrease in pressure or a change in color, it's time to change the water before using the pressure washer again. Regularly maintaining and cleaning your pressure washer, including its water supply, will help ensure optimal performance and longevity of the equipment.