You can add less water in summer and more water in winter. If you don't shake it well for a long time, the ink on it may be a little thinner. You can add less water, but you must add more water after shaking.
If the ink is too thick, the glue in the ink will make the pen sticky, and the pen will not be smooth. Of course, it will feel astringent.
Pens like to split rather than spread flat, which is the quality problem of pens. You don't need to dry it tomorrow, but you'd better wash the remaining ink, don't cover the pen cover, just dry it.
The pen will lose a lot of hair after being used for a long time, which will make the front no longer sharp and round. When the pen can't be put away properly and the division is serious, it is necessary to change the pen.