Around here, the acid test on a septic field is the hydraulic load test...they put a specified volume of water (based on BR count because systems are sized/designed based on BRs) and measure the water level in the field following the specified input. 

I was thinking perhaps use a light acid wash before painting or perhaps using a brillo pad to scratch the surface. 

I went to high school with STeve Jobs lived down the road from him.. and ended up living in the same hood as him in Palo Alto.. we were just west coast wanna be hippies smoking dope dropping acid etc etc. ( jobs more than most).. we had no clue as to how you folks live back there .. and its still that way today...

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.