Too much or insufficient water amount?

Based on the different needs, the amount of water can be adjusted on the dental chair by dentists themselves. 

Are the pressure for single spray same as multi spray system?

No, they are different because the triple spray usually produces larger amount of water. In order to have better spray effect, water system pressure should be adjusted before using. The design of connector may also affect the setting. To achieve optimal cooling effect, it is highly recommended to adjust spray pressure before using.

Difference between single spray and multi spray.

Single spray-

Cons.: Not easily get stuck; Pros: Single spray angle.

Multi spray-

Cons.: Multi-spray angle; Pros.: Easily stuck when water is not clean.