- How to operate the syringe?
You need to find a small hole in the outer circle of the product and use a syringe to add or extract bubbles. Note:add or take out very few bubbles each time, so as to better control the proportion of bubbles.
- When do you need to use a syringe?
There are too many bubbles, and the small bubbles that shake will block all the sand and prevent it from flowing down
There are too few bubbles, and small bubbles can not support the weight of sand, which is easy to collapse.