Finally using proper test kit

[TinFoilHat]

I had algae until I had the filter cleaned a couple of weeks ago. Since then, I've seen no evidence of algae.

Algae is not defeated by cleaning a filter. You probably still have algae. Do an OCLT to determine that.
Overnight Chlorine Loss Test

 

[rcortesim]

Algae is not defeated by cleaning a filter. You probably still have algae. Do an OCLT to determine that.
Overnight Chlorine Loss Test

Did that a day or two after filter cleaning. Loss of FC was minimal, though I don't remember the exact number.

 

[TinFoilHat]

I would recommend you do it again once you have a firm grasp of how the test kit works.

 

[Newdude]

Loss of FC was minimal, though I don't remember the exact number.

Minimal may still be a fail. The actual number is important.

 

[rcortesim]

The best way to home in on the pool size is by comparing PoolMaths Effects of Adding calculations with actual results tested 30 minutes after adding liquid chlorine or muriatic acid.

Adjust your pool size up for down until calculated versus actual are close.

Thanks for making me aware of this function in the app.
Earlier, I tested the water and followed the app's recommendations to add 13 oz of muriatic acid. Prior to adding the acid, my pH was 7.8 and TA was 110. About 30 mins after adding acid, pH dropped to 7.6, which is in line with the 20k volume. However, my TA rose 15ppm, from 110 to 125. I repeated the TA test, but still got 125ppm. Maybe adding only 13 oz isn't enough for testing the effects of adding?

 

[rcortesim]

I would recommend you do it again once you have a firm grasp of how the test kit works.

Do what again? You didn't quote a comment, so I'm not sure which part of the conversation you are referring.

 

[ajw22]

I tested the water and followed the app's recommendations to add 13 oz of muriatic acid.

The app does not recommend. It calculates based on all your inputs and settings.

Prior to adding the acid, my pH was 7.8 and TA was 110. About 30 mins after adding acid, pH dropped to 7.6, which is in line with the 20k volume.

Great

However, my TA rose 15ppm, from 110 to 125. I repeated the TA test, but still got 125ppm. Maybe adding only 13 oz isn't enough for testing the effects of adding?

You cannot have a result of 125 when each drop is 10ppm.

I think you are looking for a level of precision that is not in the tests.

110 versus 120 is a one drop difference. It is within the margin of error.

 

[rcortesim]

The app does not recommend. It calculates based on all your inputs and settings.

Not sure I understand what you mean. When I tap pH, it will tell me how much muriatic acid is needed.

You cannot have a result of 125 when each drop is 10ppm.

I think you are looking for a level of precision that is not in the tests.

110 versus 120 is a one drop difference. It is within the margin of error.

This test was your recommendation to use the Effect of Adding function of the app to determine the volume of my pool. Not looking for a perfect score, just one that makes sense and is somewhat consistent.

 

[ajw22]

Not sure I understand what you mean. When I tap pH, it will tell me how much muriatic acid is needed.

PoolMath calculates what to add based on what you enter. You set the current value and the target.

This test was your recommendation to use the Effect of Adding function of the app to determine the volume of my pool. Not looking for a perfect score, just one that makes sense and is somewhat consistent.

Best to use FC or pH which react quickly to chemical additions. TA is often too little of a change to show with a single chemical dose.

Lower Total Alkalinity

A lower Total Alkalinity level can help a pool owner stabalize their pH increase. We'll explain how to lower TA with a little help from muriatic acid.

www.troublefreepool.com

 

[Mdragger88]

Do what again? You didn't quote a comment, so I'm not sure which part of the conversation you are referring.

I think he was referring to doing another
Overnight Chlorine Loss Test.