Hydro Test

Are you trying to question the quality of test medium (water) used for this purpose and identify the suitable control mechanism for such upsets?

You should ask someone at the shop involved. No one else is likely to know the answer.

Not clear to me what you're asking. But short of reading somebody's mind unlikely we could give an answer anyway

This forum is being conducted in English.

Mastery of even the fundamentals of this language requires knowledge of vocabulary, syntax and sentence structure.

When your message is in broken English and makes no sense, you cannot be helped.