On the bottle it should tell you how much per gallon of water, also it depends on how bad your pool is. If you're really unfamiliar, you better get the pro's, unless its a small seasonal pool, then I go with not enough chemical, go light because you don't want anyone to die in it.
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This depends on how low the PH is. Many pool shops will test your water for free. Take a water sample to the pool shop along with the size of the pool and they should be able to give you a fairly accurate idea.
You can not purchase pH or add it even if you could find it. Adjusting the pH requires other chemicals such as muriatic acid, soda ash, baking soda. You need a test kit to determine what you need and how much to add of the above products.
That depends on the condition of the water at this particular time. A good way to find out is to take a sample of water from the pool to your pool shop where they will test it for you and tel you exactly what you require.
Acid Hydrochloric Acid , is used to lower pH, it also lowers T.otal A.lkalinity so raise the T.A. so that when acid is added, to lower the pH to the correct level, the T.A. is also reduced to the correct range.
Note: Hydrochloric Acid must always be diluted (one part acid to ten parts of water) prior to adding to the pool. Always add acid to water, never water to a
If you are buying acid at a pool store or super market it will most likely be muriatic acid which is a diluted form of hydrochloric, about 33%. You can add this directly to the pool without diluting. Add it near a return line in the deepest part of the pool with the pump running.
Depending on the size of your pool, i would suggest 6 ounces per 10,000 gallons of pool water. check it again in a couple of days. repeat this cycle until the acceptable ph is reached.