This will depend upon whether you have a plaster finish or not. First test the water to determine if you, in fact, need to add acid. If the test indicates that you need acid start with small quantities. Maybe one to two cups of acid. You don't have a lot of water to deal with here and so you could bring the water to acidic conditions easily. Wait about 20 min. for the circulation to distribute and test again. If the demand for acid is still there then you did not add enough acid and will need to add more. Continue this until you reach the goal of about 7.6. Test again the next day to see if the pH has stabilized. If so, then that total amount of acid that you added was what the pool demanded at that time. Each time most likely will be different. A vinyl lined pool can usually have a lesser demand for acid.
Ken
10000
It can be if you put concentrated acid on it however in the concentrations normally found in pools it is basically harmless I can't think of a reason to put acid on any coping especially not marble. Muratic acid is used in pools to control the pH. When left on tile or grout it will remove the color/glaze and can deteriorate the grout. Marbel is much too soft to be exposed to concentrated acid.
A gallon of 93% sulfuric acid weighs approximately 15.6 pounds.
A gallon of 25% hydrofluorosilicic acid will weigh approximately 13.6 pounds.
That depends on what you're trying to clean off. Technically, muratic acid removes some of the chemicals that make up the surface of the concete. If the stain is deep you'll need to use a stronger concentration of the muratic acid. If it's just a weak surface stain, you can dilute the acid. The muratic acid will destroy any clothing, especially cotton, that it touches. Even a drop will disolve the cotton where it touches. Concentrated muratic acid that gets in your eyes can cause blindness, so make sure you wear something to protect your eyes. It burns if you get the acid on your skin, so wear gloves and have plenty of water nearby. Beyond that, just put water in a plastic pail then add muratic acid to get to the concentration that you want. I use an automotive wheel cleaning brush to clean with muratic acid, I also wear rubber gloves when I'm using the stronger concentrations. Brush it on, work it a little then rinse it off with water. It takes a small amount of concrete off the surface and changes the appearance of the concrete, but it also removes the stain.For cleaning concrete, I would recommend using a citrus degreaser instead of muriatic acid. It is much more environmentally friendly, and you don't have to be a chemist to use it. You can purchase it at any professional construction material supply store. Available in 1 gallon and 5 gallon. It also smells a lot better than muriatic acid!!
Muratic acid or Sulfaric acid
NO. Muriatic acid is NOT safe for septic systems. This will ultimately kill much of the bacteria that processes your waste. Your septic system may become dormant and have to be pumped out totally.
One gallon of acetic acid weighs approximately 8.6 pounds or 3.9 kilograms.
The weight of 20% hydrochloric acid per gallon is around 9.4 pounds.
1 gallon
50% acid in a 6 gallon solution means that 3 gallons are acid. 9 gallons more acid will give you a total of 12 gallons of acid in a 15 gallon solution. 12 is 80% of 15.
The weight of a gallon of 15% hydrochloric acid will vary slightly based on temperature, but on average it weighs around 9.2 to 9.4 pounds (4.2-4.3 kilograms).