Perhaps it's the glare, but the water in the picture does not look very good. It looks cloudy and hazy. I think that there is probably an issue with the filtration system and/or the chemistry.
Based on the previously reported TA of 130, calcium of 280, temperature of 86 F and if the pH got to 7.8, then the CSI would be + 0.53, which could begin to cause scale and calcium carbonate clouding.
I suspect that the FC levels have probably gotten too low (perhaps even zero) on occasion. Some operators are reluctant to report chemistry that is out of range for fear of getting in trouble and they report in a number that is in range.
With the reported number of kids using the pool, it would be easy for all of the FC to become combined with ammonia and urea. If the roof is open, then the sunlight could deplete the FC fairly quickly.
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I think that the CO
2 is completely counterproductive. It just converts hydroxide into bicarbonate, which raises the carbonate alkalinity. It's the hydroxide that raises the total alkalinity, but the CO
2 converts it into a more problematic form of alkalinity. The hydroxide raises the pH and the TA, but the CO
2 only lowers the pH, not the TA.
CO
2 + OH
- <> HCO
3-
Adding muriatic acid then converts the bicarbonate into carbon dioxide and water.
H
+ + HCO
3- <> CO
2 + H
2O
Using hydrochloric acid would be a better choice because it converts hydroxide directly into water, which lowers the pH and the TA.
H
+ + OH
- <> H
2O
Therefore, the carbon dioxide only creates unnecessary cost and complexity without any benefit whatsoever. You still need to add the exact same amount of acid to offset the TA rise from the hydroxide in the liquid chlorine.
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If the retractable roof is open for extended periods of time, then the sunlight could deplete the chlorine fairly rapidly with no cyanuric acid. If the roof is going to be open for any length of time, then it might be worthwhile to apply for a waiver of the "No cyanuric acid" rule for indoor pools, since the pool is technically not strictly an "indoor" pool.
8:26-1.4 Waiver
(a) The Commissioner or his or her designee may, in accordance with the general purposes and intent of N.J.S.A. 26:4A-1 et seq., and amendments thereto, waive sections of this chapter if, in his or her opinion, such waiver would not endanger the safety or health of the public.
(b) Any agency, organization, or entity seeking a waiver of the standards in this chapter shall apply in writing to: Consumer and Environmental Health Services New Jersey State Department of Health and Senior Services
PO Box 369 Trenton, NJ 08625-0369
(c) The written application for waiver shall include the following:
1. The nature of the waiver requested;
2. The specific standards for which a waiver is requested;
3. The reasons for requesting a waiver, including a statement of the type and degree of hardship that would result upon full compliance;
4. An alternative proposal which would ensure public safety; and
5. Documentation to support the waiver application.
(d) The Department of Health and Senior Services reserves the right to request additional information before processing an application for waiver.
http://www.state.nj.us/health/eoh/phss/recbathing.pdf
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Based on the bather load, it might be necessary to use some sort of supplemental oxidation process, such as ozone or UV.
Based on the ongoing issues, I think that it would be best to have a qualified expert review all operations and advise the pool owners/operators as to what is being done correctly and what needs to be changed. The continuous growth of algae indicates a serious quality control problem.