I have a question on the ORDER or sequence of balancing chemicals in opening.
I did not see answered in pool school or the guide to opening pools or in the SLAM instructions, but I may have read these all too quickly.
SLAMing identifies get the pH correct first. What if CYA is below 20?.
It would seem that adding acid would impact the pH?
It seems that on opening the concern is getting FC to the correct level. and for that to work the pH needs to be correct and for that to be "stable" the CYA should be at a "good" starting point.
Is the order then:
Get CYA up to 25-30 with "stabilizer (Cyanuric Acid: 100%)[Pool math 3lbs 11 oz]
Check pH...let assume that the pH is 8+
Lower pH to target 7.2-7.4 by adding dry acid
Adjusting pH is dependent on Total alkalinity! TA is 70, below the 80-110 level!
Do I need to get the TA up first??? Start with a good TA?
(what is the difference between "TA" and "adjusted TA" [Alex water testing])
With CYA 20 and FC=0 (below the level on the chart) 2 lbs 9 oz of Calcium Hypochlorite 73%
As SLAMing procedure identifies the chlorine level checking will be iterative and checking any other chemical level will be in error.
My experience in SLAMing or achieving 'break-point" chlorine has been much more than 3 lbs of Cal-Hpo. it has been on the order of 12-14 gals of liquid CL (not available currently). BioGuard water analysis recommends 3 gals, but I don't know the concentration (I have 12.5%)
(SLAMing and achieving "break-point chlorine" are not exactly the same but have similar intent)
I suspect there is difference in order based on the objectives of getting levels up as in SLAMing and maintaining levels. I think in maintenance getting the TA level correct then adjusting pH
Through out the season I can work on hardness, TDS, et al
Thanx for any insight on the order in adjusting pool chemistry on opening
(I am amazed at the variances in the resultant recommendations in all of the "pool calculators" out there given the same measurements)
I did not see answered in pool school or the guide to opening pools or in the SLAM instructions, but I may have read these all too quickly.
SLAMing identifies get the pH correct first. What if CYA is below 20?.
It would seem that adding acid would impact the pH?
It seems that on opening the concern is getting FC to the correct level. and for that to work the pH needs to be correct and for that to be "stable" the CYA should be at a "good" starting point.
Is the order then:
Get CYA up to 25-30 with "stabilizer (Cyanuric Acid: 100%)[Pool math 3lbs 11 oz]
Check pH...let assume that the pH is 8+
Lower pH to target 7.2-7.4 by adding dry acid
Adjusting pH is dependent on Total alkalinity! TA is 70, below the 80-110 level!
Do I need to get the TA up first??? Start with a good TA?
(what is the difference between "TA" and "adjusted TA" [Alex water testing])
With CYA 20 and FC=0 (below the level on the chart) 2 lbs 9 oz of Calcium Hypochlorite 73%
As SLAMing procedure identifies the chlorine level checking will be iterative and checking any other chemical level will be in error.
My experience in SLAMing or achieving 'break-point" chlorine has been much more than 3 lbs of Cal-Hpo. it has been on the order of 12-14 gals of liquid CL (not available currently). BioGuard water analysis recommends 3 gals, but I don't know the concentration (I have 12.5%)
(SLAMing and achieving "break-point chlorine" are not exactly the same but have similar intent)
I suspect there is difference in order based on the objectives of getting levels up as in SLAMing and maintaining levels. I think in maintenance getting the TA level correct then adjusting pH
Through out the season I can work on hardness, TDS, et al
Thanx for any insight on the order in adjusting pool chemistry on opening
(I am amazed at the variances in the resultant recommendations in all of the "pool calculators" out there given the same measurements)
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