ChemGeek,
Ran the numbers again with zero CyA, and FC at 0.5. These Germans must have some super massive (think Panzers) chlorine generating systems. The HOCl (as ppm Cl2)
is still in the green zone so presumably safe and if maintained little or no algae, assuming a SWG system or gas injection system, or am I wrong? My wife tells me I am nearly always wrong but what do you think.
But then again one must always remember the German national anthem, Das Deutschlandlied ("The Song of Germany", also known as Das Lied der Deutschen, "The Song of the Germans"). Whose first stanza goes "Deutschland, Deutschland über alles,Über alles in der Welt". Roughly translated as "Germany, Germany above everything, Above everything in the world". So anyone who has a national anthem like this has to be crazy enough to think they have a good chance of doing it; ORP at 750 that is.
See here:
http://en.wikipedia.org/wiki/Deutschlandlied
Before anyone writes anything I'm half-German, my dad fought in the tank corp with Rommel and was captured by the British in North Africa after the battle of El Alamein. He liked the British so much while he was a prisoner-of-war in Scotland, he decided to settle in a England, once the war ended, and married my English mother. That is maybe why he was no good at looking after pools, he caught the British disease of testing the water once a month, instead of the German style of once an hour, or most probably less. As far as pools go I think I have German pool genes, that is why I am so neurotic about the pool.
So my new pool anthem could be "ORP, Ãœber alles", translated as "ORP, over everything", but I personally prefer "HOCl (as ppm Cl2), Uber alles"; versus using the British version of the song "God save our dirty pool, long live our dirty pool, God save the pool." Some may not be aware of this but the English have two other national anthems and one that might be more appropriate for their pools, or at least my sisters in the UK and that is "Land of Hope and Glory", hope being the operative word. The other national anthem which is rarely used is "Jerusalem". Some members of the British Parliament have proposed taking out the word God from the national anthem, I am not sure who would save their pools if they did that. How the world has changed, maybe it would be the Germans!
The other cultural consideration is that Europeans do not bathe as often as persons living in the US so having a high ORP of 750 might be beneficial to other swimmers in the pool in that it helps to avoid cross infection. Although strangely, generally speaking, Germans bathe much more often than many other Europeans. When I was young in England bathing twice a week was considered a lot and a luxury, now I cannot ride a London Transport bus in the summer as the smell overwhelms me, so I have changed greatly, never noticing it when I was young. Having lived in the US for 30 years I often bathe twice a day, once in the morning, and once in the evening after swimming.
But heck with the price of electricty and gas we may have to go to the European model of once or twice a week showers or baths and an ORP at 750 in our pools. It would also be "Green" or "Grey" depending on your point-of-view.
One thing got me concerned and that was your mention of nitrogen trichloride (trichloramine), based on this I would be vary wary of sending young children to an indoor pool, especially one that does not have good modern ventilation, or is public. See here:
http://en.wikipedia.org/wiki/Pool_chlorine_hypothesis
I told one of my daughters about this as it relates to young children. She told me that when she was 7 years old, now 24, and a junior lifeguard she was in charge of measuring the pool chemical levels, on an hourly basis, at the local public pool where she volunteered. A 7 year old for goodness sake, and that is why she stated she would never let her children in a public pool, period.
I told her maybe an "Ãœber alles" pool may be OK.
Here are the numbers:
Measured pH 7.0
Total Alkalinity (ppm CaCO3) 60
Free Chlorine (ppm Cl2) 0.5
Cyanuric Acid (ppm CYA) 0
Calcium Hardness (ppm CaCO3) 1,500
Total Dissolved Solids (ppm) 3,100
Total Sulfate (ppm SO42-) 0
Total Borate (ppm Boron) 0.0
Total Ammonia (ppm Nitrogen) 0.0
U.S. Gallons 10,000
Temperature (oF) 84
Total Chloride (ppm NaCl) 3029
Carbonate Alkalinity (ppm CaCO3) 59.9
Langelier Saturation Index (LSI) -0.01
% HOCl (vs. Total Free Chlorine) 71.5%
OCl- (as ppm Cl2) 0.143
HOCl (as ppm Cl2) 0.357
Calcite Saturation Level (CSL) 0.66
Calcite Saturation Index (CSI) -0.18
Aloha.
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