Hi. I just upgraded to a premium on the app. As I use the pool math app it gives me the option of 14.5% and 29% for muriatic acid. I get this stuff from Home Depot. Should I just use the 29% figures?
Muriatic Acid Concentration
- Thread starter Rick T
- Start date
- Jun 22, 2014
- 47,790
- Pool Size
- 17888
- Surface
- Fiberglass
- Chlorine
- Salt Water Generator
- SWG Type
- CircuPool RJ-45 Plus
Rick, when I go to the APP under both Effects if Adding Chemicals and Chemical Additions I get an option for 31.45 strength. Are you not seeing that anywhere?
- May 3, 2014
- 58,369
- Pool Size
- 6000
- Surface
- Fiberglass
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-40
- Jun 22, 2014
- 47,790
- Pool Size
- 17888
- Surface
- Fiberglass
- Chlorine
- Salt Water Generator
- SWG Type
- CircuPool RJ-45 Plus
I see. Scroll UPWARDS on that menu and you should see the 31.45. That's what I had to do.
Also, as I get my ph (which is currently 7.8) back down to 7.0-7.2, how soon will my TA respond and go down? How soon do I retest TA? You helped me with a month ago with issues. I eventually had to empty my pool and start over. My replaster guy came out yesterday and polished the pool, I had white spots and he over acid-ed my pool making it rough and gritty. (thus another empty and refill). I'm trying to get the newly added water to the right numbers.
- May 3, 2014
- 58,369
- Pool Size
- 6000
- Surface
- Fiberglass
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-40
- Oct 25, 2015
- 5,148
- Pool Size
- 25000
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- CircuPool RJ-60 Plus
Baume is a measure of viscosity. Some manufacturers control the process to a given viscosity that yields 31.45% MA. It's always seemed weird to me that they market to the public using Baume which is a term that very few people understand or even care about.
- May 23, 2015
- 24,405
- Pool Size
- 16000
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-60
It a measure of specific density, not viscosity. When dealing with highly concentrated solutions, especially ones that are as acidic as MA, it’s far easier to use density as a process control rather than trying to measure concentration. You can’t use a pH probe to measure concentrated acidic or caustic solutions, but you can easily use a mechanical float as a visual indicator. Baume was also used in pharmaceutical applications as it was originally used to compare the salinity of various solutions.
Last edited:
- Oct 25, 2015
- 5,148
- Pool Size
- 25000
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- CircuPool RJ-60 Plus
Yesterday I added 7 pounds of Calcium Hardness Increaser from Home Depot. My CH was 225. We got about an inch of rain overnight, I tested the water this morning at my CH is lower, 175. I took my sample about 12" deep and the pumps had been on for about an hour. My ph is still low at 7.2 (up from 7.0 yesterday). I retested TA and it has fallen from 210 to 180. I plan on keeping ph between 7.0 and 7.2 until TA gets to the acceptable range of 79-90. How long should it take to drop? Thanks.
Also, I need a better tutorial for the Pool Math app. I upgraded to premium yesterday. Since I'm starting with a new complete water fill I started a new log. I inputted today's readings but it still shows yesterday's values. I added the reminder to clean the filters but the reminder came up immediately and I don't know how to reset it.
- May 23, 2015
- 24,405
- Pool Size
- 16000
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-60
When you add muriatic acid to pool water it instantly reacts with bicarbonate and converts it to dissolved CO2. The pH drops along with the TA. As the CO2 outgasses from the water, the pH rises. So you have to wait for the pH to recover a bit and then add more acid. I would suggest you wait until the pH gets to 7.6 and then you knock it down to 7.0 again. Aerating the water by running water features or spa jets can help to increase the rate of pH rise. Reducing TA is a process, not a one time treatment.
Lower Total Alkalinity - Trouble Free Pool
Lower Total Alkalinity - Trouble Free Pool
Thanks. I have the waterfall on. ph is up .2 from yesterday and TA down 30. Will do as you said, wait for 7.6 then hit it with the recommended muriatic acid to get back down to 7.0.
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