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  1. D

    Is Combined Chlorine ‘contagious’?

    Stupid sounding question, I know…but sincere. Draining an indoor spa which needs more time to oxidize the combined chlorine, when slamming, than I care to wait. This will be following an AA treatment for imbedded rust stains. So the question is this: Will leaving a percentage of existing...
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    H2o2, AA: affect ORP?

    ORP reading vs test is WAY off. Can residual Hydrogen Peroxide, Ascorbic Acid, or Sequesterant cause this? Orp is reading in normal range- (fas Dpt)Test is 3x higher I shocked/ superchlorinated a spa (1000g) to break combined cl. Following that: Used H2o2 to drop cl levels. Used AA to remove...
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    convert AA weight to volume (with qualifying questions)

    I am going to try AA stain treatment in an indoor spa: From searching and reading various postings, the closest I get to a consensus on the amount of Ascorbic Acid to use is 1 lb per 10,000 gal. suggesting that 1.6 oz (weight) would be appropriate amount for a 1000 gal spa. This seems like an...
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