National Plasterers Council (NPC) and their references to studies that show chemical levels related to deleterious effects to pool finishes
To put bounds for this inquiry for CYA:
Using as a guide from the IPSSA Basic Training Manual 2006, pg 45 “The maximum cyanuric acid level allowed in commercial or public swimming pools by most every health department in the U.S. is 100 p.p.m. There are a few states that allow up to 150 p.p.m." The IPPSA recommendation for Residential Pools and Spas:
* Minimum 10 p.p.m.
* Ideal: 30-50 p.p.m.
* Maximum: 100 p.p.m.”
Therefore, for this discussion, MAX CYA is 150 p.p.m
In addition, any study results of effects of higher chlorine levels in relationship to maintain sanitation at higher CYA on deleterious effects?
One NPC Reference that is in public domain:
https://c.ymcdn.com/sites/npconline.../resmgr/Docs/startup-card-current-rev3_wa.pdf
Cheers
Cd
- Is there any study that shows that Cyanuric Acid (CYA) above NPC’s recommended levels cause deleterious effects to pool finishes when saturation index (SI) is in recommended range or (+/-.3) and carbonate alkalinity is kept above 70 p.p.m and total alkalinity below 130 p.p.m. ?
- Is the NPC recommended ranges as a result of deleterious effect studies or recommended from the IPPSA, health departments, etc?
To put bounds for this inquiry for CYA:
Using as a guide from the IPSSA Basic Training Manual 2006, pg 45 “The maximum cyanuric acid level allowed in commercial or public swimming pools by most every health department in the U.S. is 100 p.p.m. There are a few states that allow up to 150 p.p.m." The IPPSA recommendation for Residential Pools and Spas:
* Minimum 10 p.p.m.
* Ideal: 30-50 p.p.m.
* Maximum: 100 p.p.m.”
Therefore, for this discussion, MAX CYA is 150 p.p.m
In addition, any study results of effects of higher chlorine levels in relationship to maintain sanitation at higher CYA on deleterious effects?
One NPC Reference that is in public domain:
https://c.ymcdn.com/sites/npconline.../resmgr/Docs/startup-card-current-rev3_wa.pdf
Cheers
Cd
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