quantumchromodynamics Posted December 23, 2009 Report Share Posted December 23, 2009 You should get your chlorine level down as soon as possible by using sodium thiosulfate. At 50 ppm, the ascorbic acid might not work. You should also begin to slowly raise your alkalinity and pH using baking soda, not sodium carbonate. Do it in small increments or you could cause bigger stains. Quote Link to comment Share on other sites More sharing options...
Gavin Posted December 23, 2009 Author Report Share Posted December 23, 2009 You should get your chlorine level down as soon as possible by using sodium thiosulfate. At 50 ppm, the ascorbic acid might not work. You should also begin to slowly raise your alkalinity and pH using baking soda, not sodium carbonate. Do it in small increments or you could cause bigger stains. ok thanks. I'm going to the pool shop in the morning and will buy some of that sodium thiosulfate. I also need a thermometer. I've been trying out this calculator. it looks good: http://www.poolcalculator.com/ I guess I'll get the baking soda from a foodstore. Many thanks for the help! much appreciated! Quote Link to comment Share on other sites More sharing options...
quantumchromodynamics Posted December 23, 2009 Report Share Posted December 23, 2009 2.835 grams of sodium thiosulfate will reduce chlorine levels by 1 ppm in 1,000 gallons of water. Quote Link to comment Share on other sites More sharing options...
Gavin Posted December 24, 2009 Author Report Share Posted December 24, 2009 2.835 grams of sodium thiosulfate will reduce chlorine levels by 1 ppm in 1,000 gallons of water. my pool is 15,000 gallons. I guess I need a lot of that. Quote Link to comment Share on other sites More sharing options...
Gavin Posted December 24, 2009 Author Report Share Posted December 24, 2009 I need 1,700 grams of sodium thiosulfate to get FC down to 5ppm Quote Link to comment Share on other sites More sharing options...
quantumchromodynamics Posted December 24, 2009 Report Share Posted December 24, 2009 45 ppm X 15 X 2.835 = 1,914 grams, or about 4.22 pounds. Add 2 pounds and then retest. Quote Link to comment Share on other sites More sharing options...
Gavin Posted December 24, 2009 Author Report Share Posted December 24, 2009 45 ppm X 15 X 2.835 = 1,914 grams, or about 4.22 pounds. Add 2 pounds and then retest. Thanks for the formula much appreciated. However I think I calculated the FC wrong. I used 10 drops so I think I should have: 10 x 0.5 = 5ppm. Ouch I got to be more careful! Quote Link to comment Share on other sites More sharing options...
Gavin Posted December 24, 2009 Author Report Share Posted December 24, 2009 You should get your chlorine level down as soon as possible by using sodium thiosulfate. At 50 ppm, the ascorbic acid might not work. You should also begin to slowly raise your alkalinity and pH using baking soda, not sodium carbonate. Do it in small increments or you could cause bigger stains. I got some baking soda today and added 2lbs and will check in the morning. I still have another 2lbs. no luck with the ascorbic acid test. stain still there. I took a photo and will post it in a sec. Quote Link to comment Share on other sites More sharing options...
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