One cause could be electrolosis , dissimilar metals touching each other , another cause acidic water eating the copper from the inside out , third it could be bad pipe , in the early 1980's they built houses near me with copper pipe , after 15 years they were all having problems with leaks .Prepare yourself to replace the pipes in your house , its going to need to be done .

My main ingredients for weapons were simply a boric acid (borax) and sugar powder mix (about 1 to 10 borax to sugar).

When Chlorine reacts with water, it produces hydrochloric acid and atomic oxygen (For those of you following along, that's O not O+O, which is what we actually breathe.)  

Because chocolate contains heart healthy nutrients such as flavonoids, methylxanthines, polyphenols and stearic acid, which reduces inflammation and increase good cholesterol (high-density lipoprotein or HDL cholesterol).

Granite stains when they come into contact with acidic solutions.

Be very careful in the use of bleach since hydrochloric acid, sulfuric acid, or other types of acid may react with the bleach and cause dangerous vapors to form.

I have scheduled sandblasting, then boric acid and vinegar spray followed by paint wood joists subfloor below, and Drylok supreme along the foundation wall. 

My own personal home and one of my higher end homes has acid stained and sealed concrete.

One is called Hair and Grease, it comes in a bag as it's an acid product-so consider your pipes and the environment.

Grind all concrete with a diamond wheel, don't use the acid etch.