Why Pump Motor Off To Add Acid

by Mike
(Hemet,CA)

Why is the pump motor supposed to be turned off when adding acid?


It seems like you should be circulating the water to distribute the acid rather then letting is 'pool' in one area?




Thanks for the question Mike

I've received this question before but I'll take another shot at explaining it.

Sodium bicarb is used to raise the pH and TA and acid is used to lower them. It's the application that's important because you want to lower or raise one without hitting, or to lessen the effect of, the other.

Raising the pH is done through water movement, aeration, splashing around, water features such as slides, water falls, out-gassing, etc... Bubbles form and release CO2 (carbon dioxide).

To lower the pool pH with acid you also need water movement.

When you have the pump off there is no aeration so the acid or bicarb hits the TA of the equation.

I'm not a chemist so I can't give the molecular structure of this, but I know it works. How do I know? Because I've done it hundreds of times on my pool route in AZ and as the pool operator for the Y.


When the pump is on the acid and bicarb hit the pH. When the pump is off and allowed to sit for 4 - 5 hours, the TA is hit.

Now for the pooling part. I've made it very clear throughout my site that acid is heavier than water and will sink to the bottom. You need to gently sweep the area to break up any hot spots of acid. This will ensure a proper dispersion of the chemical and not allow it to sit in one spot.

Some people disagree with this process. They call it the "slug method" that has been "scientifically disproven". They prefer to lower both the TA and pH then introduce air into the pool to raise the pH.

I really don't care about the science of this procedure. I know it works. As was stated, I've done it because I was and still am a real pool guy. I didn't have time to hook up a compressor while I had my route. What would happen? I'd need to go back and get it after a few hours. This would cause alot more driving. And I also didn't have much time to make corrections at the Y pool. They had to be done quickly and effectively.

So that's pretty much it. I hope this answered your question.

To post a reply, or if you have a similar question, you can see your post on the Q&A page in the "Alkalinity" category.

Check back to this post for updates or answers.

If you feel your situation is more complex and want immediate assistance (within 24 hrs) you can make a donation of $35 per

hour and I'll answer your questions by phone.

Have I helped you find a solution to your pool problems? Did this information help you? Please consider making a donation to help keep this site going. Thank you.









Robert

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If My Pool Is Chemicals Are All Out Or Target What Do I Tackle First

by Anthiny
(Dorado, Puerto Rico 00659)

Example.
pH:8.0
Chlorine: 0
Alkalinity: 50
cyanuric acid: 0
Phosphate: 1000

Witch one of this do I tackle fist? Is the a priority witch I should attend first? And if yes, why. Plz help I work at a pool company and will like to help my customers better with the rite information.

Also if you guys have information that will help me understand the pool chemicals I will appreciate it.




Thanks for the question Anthiny

My entire site is dedicated to helping pool owners have clear and balanced pool water along with understanding filters and filtration systems. Most questions can be answered through email, going through my site, or talking to me personally on the phone for a donation of your choice.

It would take a very long time to write everything you need to know about pools and water chemistry but I'll answer your specific question.

I would first bring the pH down to 7.0 - 7.2. Chlorine works better at a lower pH level. It's 12 oz. of acid to lower the pH 0.2 per 10,000 gallons.

Next is to shock the pool with liquid chlorine or bleach and get some stabilizer (CYA) in the pool. This can be done with either dichlor chlorine or a combination of liquid chlorine and granular CYA. The range for CYA is 30 - 50ppm. You can go as low as 20ppm then use chlorine tabs through the week.

Tabs have both chlorine and CYA in them so you'll be adding both. Remember there's no chemical to reduce the CYA. You must do a partial drain and refill. Start low with the CYA and work up. Be careful when using Dichlor as it can get out of hand quickly. For every 10ppm of chlorine added with Dichlor, you'll raise the CYA by 9ppm. For every 10ppm of chlorine added with Trichlor tabs you'll raise the CYA by 6ppm.

Next is to raise the TA. Use 1 lb. of baking soda to raise the TA 10ppm per 10,000 gallons.

I've made several videos on YouTube on clearing up green pools. I would encourage you to watch them. As I go through the videos I take and show the readings and what to do in each situation.

On my home page on this site you can watch a video where I clear up a cloudy pool in 2 days for $4.50.

You must remember that there's no one way to clear up a pool or to balance it. Each pool and situation is different. This is why the chemical readings are so important. A green pool is not the same as another pool. A pool can have low pH and high TA with high CYA and another pool will have high pH and low TA with the CYA of 0ppm. And another may have high pH and TA with high CYA of 150ppm and CH of 800ppm.

Don't be concerned at all about the phosphates. I also did a video on that and can be seen on YouTube.

I hope this has answered your question to your satisfaction.

To post a reply, or if you have a similar question, you can see your post on the Q&A page in the "Chemical Questions" category.

Check back to this post for updates or answers.

If you feel your situation is more complex and want immediate assistance (within 24 hrs) you can make a donation of your choice and I'll answer your questions by phone.

Have I helped you find a solution to your pool problems? Did this information help you? Please consider making a donation to help keep this site going. Thank you.









Robert

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Turning Pump Motor Off When Adjusting Alkalinity

by Cindy

This is after the fact but was any damage done seeing I left pool pump on while treating alkalinity?

Thanks much!

Cindy




Thanks for the question Cindy

There shouldn't be any residual or collateral damage from leaving the pump running. Some bicarb will be mixed in and some may fall to the bottom. Sodium bicarb is very safe to use. People use it in recipes.

All that will happen is it may increase your pH level. It may touch on the total alkalinity (TA) but most of it will go to increasing the pH.

There are different schools of thought on how to raise and lower TA and pH. The above method is the one I've used countless times and it works each time. Some call it the "slug method" but it does work. Check the pH and make the right adjustment if it was raised. Normal level is 7.4 - 7.8.

To post a reply, or if you have a similar question, you can see your post on the Q&A page in the "Alkalinity" category.

Check back to this post for updates or answers.

If you feel your situation is complex and want immediate assistance (within 24 hrs) you can make a donation of $35 per hour and I'll answer your questions by phone.

Have I helped you find a solution to your pool problems? Did this information help you? Please consider making a donation to help keep this site going. Thank you.









Hope this helps and have a great Summer.

Robert

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