1. I feel that the pen is slow or the lines are easy to break. This means that the ink is thick, so I need to add some water.
2. The edge of the next stroke is too wet to see the edge of the stroke (the "skin" in calligraphy). There is too much water in this water, so you need to add a proper amount of original ink.
Maintenance:
1. It takes about a minute to clean it thoroughly. After washing, you can use toilet paper or raw rice paper to absorb the water in the pen and hang it to dry.
I hope I can help you.