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Sodium bisulfate is an acid that is sold in granular or powdered form. It has the advantage of being a bit safer and gentler than muriatic acid. Sodium bisulfate for pools is available at most home and pool supply stores. Different manufacturers may provide different instructions for use. In some cases, it may be necessary to dissolve the sodium bisulfate in water before adding it to the pool, while other products may be added directly to the pool water in powdered form. Follow the manufacturer's instructions to figure out the correct amount of sodium bisulfate based on your pool's size and the current pH of your water. You may wish to use of the recommended amount in order to avoid lowering the pH of your pool too much. You can also use a pool calculator, such as this one: http://poolcalculator.com/. Sodium bisulfate is relatively gentle, but it can still cause serious burns and irritation. Wear gloves and clothing that covers your skin, such as a long-sleeved shirt and long pants. Always work in a well-ventilated area. If you are concerned about the wind blowing acid granules into your face, wear protective goggles or a face shield. If you get sodium bisulfate on your skin, wash thoroughly with soap and water. Go to the doctor if you experience skin irritation that doesn't go away after washing. If you get any sodium bisulfate in your eyes, rinse with cold water for at least 15 minutes and then get medical attention. If you swallow any of the powder, rinse your mouth out with water and drink at least one tall glass of water. Seek medical attention immediately. With the pump running and the jets on, slowly add the acid to the pool water directly over the return jets. Take care to keep the powder away from the skimmer. Get close to the water when you pour, and take care not to let the wind blow any of the powder back onto you. Give the acid at least 4 hours to circulate, then test again. Since sodium bisulfate can also decrease your pool's total alkalinity, it is important to test that as well and make sure it is still within an acceptable range. Make any necessary adjustments based on the results of the test. Don't wait longer than 24 hours after adding the dry acid before re-testing your pool's pH levels. If your pool's total alkalinity level is too low after adding sodium bisulfate, raise it by adding an alkalinity increaser, such as baking soda or sodium sesquicarbonate, to the water. Alkalinity boosters for pool use are available in most pool and home supply stores. Soda ash can also raise your pool's alkalinity, but may cause the water's pH to become too high again. Follow the manufacturer's instructions to determine how much of any alkalinity booster to add to your pool based on the size of the pool and the current alkalinity level. If you are using plain baking soda, you can use a pool calculator, like this one: http://poolcalculator.com/. Although sodium bisulfate is relatively gentle, it can still irritate your skin and eyes. Give the acid plenty of time to dissolve and circulate throughout the pool before you jump in.

Summary:
Buy sodium bisulfate or "dry acid" for the pool. Follow the instructions on the package. Determine how much sodium bisulfate to add. Use safety precautions. Pour the dry acid into the pool over the return jets. Wait a few hours and re-test your pool's pH. Add an alkalinity booster, if necessary. Wait at least 4 hours before swimming.