Method of using soil pH meter and disposal of excess salts

How to use the soil pH measurement tool
How can we get rid of excess salts in the soil in a very easy and inexpensive way.
What do I do to get rid of excess salts in the soils and ponds?
Soil pH (acidity) is reduced by adding one of these elements: humic acid - organic fertilizer _ sulfur.
The acidity is added by adding: Super calcium phosphate or gypsum agriculture.
PH measurement tool link for those who wish to receive it:
www.amazon.com...