After a period of use, the titanium rod filter cartridge will experience a certain degree of blockage, resulting in a decrease in flow rate and an increase in pressure at the front end of the filter, such as from below 0.22mPa to above 0.3mPa. At this time, the filter cartridge needs to be cleaned, and there are generally several cleaning methods:

1. For newly used filter cartridges, the method of backwashing with clean water and blowing back with gas is generally used for cleaning, that is, using water slightly higher than the working pressure (such as 0.3mPa) to inject water in the opposite direction for cleaning. The recoil time is about 1-3 minutes.

2. When the filtration effect does not significantly improve after multiple backwashs, a hydrochloric acid solution of less than 5%, sulfuric acid solution of less than 8%, or NaOH solution of less than 10% can be used to soak at room temperature and then rinse with clean water.

The specific choice of acid washing or alkali washing should be based on whether impurities in the filtrate are easily soluble in acid or alkali.