Calling all pool chemical experts

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  #1  
Old 06-14-08, 05:47 AM
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Calling all pool chemical experts

new pool owner ( that explains it)

roughly 14,000 gal pool.
Total Chlorine -very low
Free Chlorine -very low
PH - high
Total Alkalinity --Off the charts high

After filling the installer said shock it. after adding shock, I was told by a bunch of people to get the Alkalinity ppm where it need to be using muratic acid. Right now it off the charts high after adding a gallon ( 16 oz at a time)


So, What do you guys/gals think?

Thanks
Jim
 
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  #2  
Old 06-14-08, 07:53 AM
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what does high, very low, very low, off the charts mean??? Need some numbers to be able to help.
Muriatic raises ph not alkalinity, baking soda will raise alkalinity which will also raise ph. Need to wait 12 hours after adding chemacals to test again.
 
  #3  
Old 06-14-08, 09:30 AM
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Originally Posted by todrut View Post
what does high, very low, very low, off the charts mean??? Need some numbers to be able to help.
Muriatic raises ph not alkalinity, baking soda will raise alkalinity which will also raise ph. Need to wait 12 hours after adding chemacals to test again.
Total Chlorine -very low = 0 ppm
Free Chlorine -very low = 6.2 ppm
PH - high = 8.4ppm
Total Alkalinity --Off the charts high Greater than 240 ppm
 

Last edited by thepooder; 06-14-08 at 09:47 AM.
  #4  
Old 06-14-08, 10:28 AM
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first things first,.... todrut is correct in wanting numbers, the one thing he is incorrect about [ i believe this was an oversight, as he is usually , pretty right ].. that is muratic acid LOWERS ph & to a lesser degree alakalinity.

the main thing you need to know before you add any chemicals to your pool is how many gallons are you dealing with, if your pool is square or rectangle multiply the length x the width x the average detph x 7.5 = total gal.

if round multiply diameter across x diameter across x ave. depth x 5.9 = total gal

if free form measure perimeter x perimeter x ave. depth x 4.165 = total gal

what type of surface does your pool have plaster / colored plaster/ vynal liner / fiberglass ? ?

post back

steve
 
  #5  
Old 06-14-08, 10:51 AM
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Above ground pool. 24' round 13,600 gal. Vinyl liner
 
  #6  
Old 06-14-08, 11:53 AM
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Had a brain fart, hey it happens... I was confused by your post about using muriatic to raise alk.
Anyhow, here is what you need to do. First what are you using to test? Strips or reagent kit? Second how old are they(less than year)? Have they been left in the sun or high heat? Or any possibility of contamination? If any has happened you need to buy fresh strips or reagents. Now wait till late this evening without putting anything else in pool and test water again. Be sure you are using water at least a foot deep. Let me know what you get so I can make suggestions. In the mean time do you have a auto chlorinator of a floater? If not I would suggest getting a floater for chlorine sticks or tabs.
 
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Old 06-14-08, 01:11 PM
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Strips are new and date is good. ( no heat stress or contanimation that I know of)

I will go buy a floater today.

I will post results later.

Thanks
Jim
 
  #8  
Old 06-14-08, 07:51 PM
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latest test strip results

Free Chlorine -very low = 0 ppm
PH - high = 8.4 ppm
Total Alkalinity --Off the charts high Greater than 240 ppm
(test strip was a dark blue yesterday, getting lighter tonight, but still over 240 ppm)
Cyanuric Acid -- 30-50
 
  #9  
Old 06-14-08, 08:18 PM
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you'll need to add 3 gallons of muriatic acid to get the alk down. Get floater filled with sticks or tabs and put in pool. Test again in 4-6 hours after adding. When we get ph and alk under control we will shock pool but not till we get balanced. Keep me posted...
 
  #10  
Old 06-15-08, 05:10 AM
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I have heard conflicting ways to add acid. with or with out pump running, all at once or diluted


I put in floater last night
 
  #11  
Old 06-15-08, 05:37 AM
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Always add chemicals with pump running.
 
  #12  
Old 06-15-08, 06:13 AM
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should I just pour it in just past the return and all at once
 
  #13  
Old 06-15-08, 06:23 AM
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you can pour it in all at once slowly, don't splash. Then test in 4-6 hours.
 
  #14  
Old 06-16-08, 03:53 AM
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After 3 gallons of acid and a floater added with 2 tabs in it

Free Chlorine .5 ppm
PH - 6.2ppm
Total Alkalinity --120ppm
Cyanuric Acid -- 0 ppm
 
  #15  
Old 06-16-08, 04:50 AM
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I would recheck your Ph, 6.2 is way too low. Your TA looks good, with an initial TA of 240 3 gallons shouldn't have pushed it that low.

I would recommend adding muratic acid at 1.5 quarts every 4-6 hours instead of 3 gallons all at once for a pool the size of yours.

If the PH checks out in the 7.2-7.8 range then you'll be ready to shock it.
 
  #16  
Old 06-16-08, 09:13 AM
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We're getting there, Add 1.5lbs of soda ash (ph+). Be sure NOT to use baking soda or alk+

I would keep 3 tabs in floater, needs to come up a little.

Of course 4-6 hours test again, should be good to go...
 
  #17  
Old 06-16-08, 06:21 PM
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or, your ph is low , you have no chlorine reading,.... kill two birds with one stone by adding a gallon of loquid chlorine,

also you won't be able to keep chlorine in your pool unless you add conditioner aka cyanuric acid.


steve
 
  #18  
Old 06-20-08, 02:38 PM
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Thanks for all your help all my numbers are great.

Thanks again

Jim
 
  #19  
Old 06-20-08, 07:27 PM
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your welcome, glad to help...
 
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