use either muriatic acid or dry acid (sodium bisulfate)
You could add water.
add acid
To raise the pH of your pool you add soda ash (sodium carbonate). To lower the pH of your pool add muriatic acid (hydrochloric acid) or sodium bisulfate. You should always add chemicals with the pump running and check your levels again once the newly added chemicals have been circulated around the pool.
You can lower the PH level by using this stuff called PH Down. Go to a local pool store and ask about it.
No
You would a pH testing kit from the pool supply company. If you get a meter you simply read it and then adjust the pool by adding the recommended chemicals until you have the proper pH. Using pH strips you match the color you get to a grid which shows what that color represents on the pH scale.
Just go to your local pool supply store and ask for pH adjusting chemicals.
Yes it can be, but using chemicals manufactured for the swimming pool will help you not to have problems with clouding or unneeded filter use.
You can still get in the pool. The chemicals work best when the pH is balanced so add PH PLUS. If the PH is really low it is very acidic and could burn the eyes a bit
Yes; there is no problem with most normal pool chemicals, such as chlorine algaecide acid, muriatic acid, and pH controls.
Initially, you can't. What you do to lower alkalinity is first lower the pH to under 7.2, but not lower than 6.9. Then you aerate the pool, by creating bubbles with your brush, or by running a water feature, if you have one. This will lower your alkalinity. Maintain this lower pH and aerating until you get your alkalinity where you want it. Then retest your pH. If it is now too low, you add Mule Team Borax, say a 1/4 a cup, and then retest. The borax will raise your pH without raising your alkalinity. See the poolforum.com for more help if needed.
add a PH reducer chemical
Yes, it is common for the company cleaning your pool to also check the ph and help you with any corrections that need done to the chemicals.
Sodium bisulfate (AKA sodium hydrogen sulfate or sodium acid sulfate) is an acid that will lower pH. If you lower the pH of a swimming pool buffered with baking soda (sodium bicarbonate) and maybe cyanuric acid (stabilizer), your alkalinity will go down, along with the pH. But usually, what people want is to lower the alkalinity (or TA) without lowering the pH. When you lower the pH on a carbonate buffered pool, you convert some of the carbonates into carbonic acid, where they no longer contribute to the measured alkalinity. But, as soon as you raise your pH, the carbonic acid switches back to carbonate, and your TA goes right back up with the pH. To actually LOWER the alkalinity, you have to lower the pH, and then REMOVE some of the carbonic acid, which you can do be aerating the pool, since carbonic acid is a form of carbon dioxide gas.