Typically if the pH is low the alkalinity has dropped, also. Always adjust Total Alkalinity first. The pH will increase also. But you might still have to tweak the pH with soda ash when the alkalinity reaches 100 ppm.
A low ph means acidity. You have to add an alkaline to neutralize. Do it slowly so you don't overshoot the other way. By the way, ph less than 7 is considered acid and greater than 7 alkaline.
I would suggest that you go to a pool supply store to see the range of chemicals for regulating pH, chlorine, etc. You don't want to end up with a mucky, slimy mess.
Every year I start buying all my pool supplies around late March early April because that's when stores start putting out there supplies for summer and I like to get first pick on everything. They put a pamphlet out ( at Wal-Mart & Kmart) with the chemicals that tell you what to do in case this chemical is off or if you have to much chlorine. I buy the sticks that has all the levels(which I purchase at a pool store). Lite House pools and spas carries a lot of what you need (say if Wal-Mart or Kmart) don't carry them because the cost is SO much cheaper, but if you need a chemical like Flauk or Ash that's the only place you can buy them. You need to bring PH up so you would need PH Plus and that is measured by how many gallons per dose and how much it's off and that's where the book and sticks come in . Hope this helps and good luck. This is what I do and I've been doing this for years!You also can take a sample of your water to be tested at a pool store and they can give you all the info you need.
Adding the proper amount of soda ash will raise add alkalinity to your water and raise the pH level. Start slowly, and keep testing until you reached a pH of about 7.2.
Also, make sure you clean out your skimmer, vacuum the pool, and backwash your filter (if needed) regularly. Decaying plant and animal matter is one thing that makes the water acidic.
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