Why is my pH Rising in My Pool? - Solved!

Rising pH can be frustrating for many pool owners and pool pros. You can add acid and then the next week the pH is back up or you may be trying to lower it and nothing seems to be happening.

Swimming pool pH is often a test factor that is misunderstood or not given the proper attention. We know it is one of the big 3 test factors alongside Chlorine and Alkalinity but why is the pH important to measure and keep in the range each week? I think the premiere expert on pH would be the late Bob Lowry and below is a podcast I recorded with him on the subject.

Chapter Marks:
00:00 Introduction
01:41 Weak Muriatic Acid in Stores
03:40 Saltwater Generator
05:28 Pool surface type
07:14 Aeration
0:49 High Alkalinity
13:48 Add borates
16:23 LSI

Bob Lowry has created over 100 chemicals used in today’s Pool & Spa Industry and has written over 20 books on pool & spa chemistry. He has been in the industry for over 47 years and is the Lead Consultant at Lowry Consulting Group, leads the Pool Chemistry Training Institute, and has created the Certified Residential Pool & Spa Certification Program. Learn more at https://pcti.online/

Here is a podcast I did with Bob Lowry on the subject:
Raising and Lowering the pH in a Pool With Chemistry Expert Bob Lowry: https://www.buzzsprout.com/110832/7361284

I think it is also important to note that you may think your pH is high in your pool when in reality it is perfectly fine at 7.8. The ideal ranges may not be ideal for your pool based on the LSI. If you haven’t studied or used the LSI is pool balancing there is probably no greater resource than Orenda. Not only can you use their free LSI calculator but they offer three free courses that will teach you all about how pH at a higher level can benefit your pool.

Orenda: https://www.orendatech.com/

Many things can cause the pH to rise in your pool. A Saltwater generator produces a byproduct that causes the pH to rise rapidly. Any spa spillway or water feature will cause the pH to rise through aeration. The pool surface in itself can cause the pH to rise. High alkalinity in the pool can cause the pH to stay high.

pH is the most important test factor for your swimming pool and if it gets out of balance there are many negative effects that you will encounter. The ideal pH is 7.5.

Low pH will cause:
Corrosive Water
Stains
Etched plaster
Eye & Skin Irritation
Cloudy Water
Increased Chlorine Activity
Destruction of Total alkalinity
Stretching of Vinyl Liners
Blistering of Fiberglass Pools

High pH will cause:
Scale Formation
Stains
Cloudy Water
Short Filter Cleaning Cycles
Eye & skin Irritation
Poor Effective Chlorine

Testing for pH:
Testing once a week is ideal. For a new pool, start-up testing daily for the first two weeks is recommended. But once a week will give you a good indication of how stable the pH is in the pool water. There are various ways of testing the pH; test Strips, basic test kits, and Taylor Kits that use reagents. Alternate testing can be done with the ColorQ Pro7 Photometer testing and Digital pH testers.

Lowering high pH:
If the pH starts to get high in your pool the only way to lower it is by adding acid. Either a dry acid or liquid acid. Muriatic Acid of 31.45% is the most common acid used to lower the pool's high pH. Dry acid or Sodium Bisulfate is the dry form of acid that can be added to lower the pH. Some test kits like the Taylor K-2006 will have an Acid Demand Test. This is a reagent test that will tell you how much acid to add to your pool to lower the pH. A chart is included with pool gallons and how many pints or quarts to add depending on the test results.

Raising low pH:
If your pH is low you can raise it up using a base. A base is the opposite of acid and it will raise the low pH up in your pool rapidly. The best base is Borax as it will raise the pH without raising the Total Alkalinity. Baking Soda (Sodium Bicarbonate) works well also but it is mainly used for raising the Alkalinity and requires large amounts to raise the pH. Soda Ash (Sodium Carbonate) raises the pH well but it also raises the pool's Alkalinityup so use Soda Ash if Borax is not available in your area.

Bob Lowry has written extensive Tech Bulletins and here is an excerpt from one on pH for you.

Source:
https://poolchemistrytraininginstitute.com/adjusting-ph-and-alkalinity-in-swimming-pools/
The article goes into very detailed explanations of pH and it is worth reading the entire write-up by Bob Lowry.

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