While I've never heard of an official expiration date, it does lose strength over time. You can usually tell old acid by it being more yellow in color instead of clear. I've never had it do any harm by using old acid, but it did take a bit more than if it was fresh.
liquid pool acid is Muriatic acid or more commonly know as Hydrochloric acid (HCl)
5/06
The hydrochloric acid is used for pool; this is a water solution of HCl.
Pool acid typically refers to muriatic acid, which is a common acid used to lower the pH levels in swimming pools. The main ingredient is hydrochloric acid. It is important to handle muriatic acid with care as it is highly corrosive and should be diluted before adding it to the pool water.
acid is added to a pool when alkalinity is too high. Take a sample of pool water to your pool shop and have it tested by them. they will tell you what is required.
pool acid, also known as hydrochlorous acid, is actually a chlorinating agent, in addition to being an oxidizing agent. that is, it will *produce* some small amounts of aqueous chlorine, as opposed to eliminating it.
Acid
Muratic acid or Sulfaric acid
With a new pool surface installed- Diamond Brite or any aggregate surface- is it possible or doable to acid wash the pool with water in the pool??
Add potash. See your pool shop with a sample of your water and the size of your pool and he will give you what your pool requires.
No
Ad cyanuric acid/stabilizer, this is available from your pool shop