waterbear Posted June 13, 2011 Report Share Posted June 13, 2011 Waterbear Thanks for this great write-up again. Finally had the chance to implement it on a fresh fill today. Unforetunately things did not go as planned. First, not directly an issue with your instructions but I wonder if the Pool Calculator is producing accurate numbers for me. I used it to calculate the amount of Baking Soda to put into the tub to bring the TA from 20 to 100 and my tub ended up at 140ppm... This of course made the PH go way high. Ended up bringing it both down (by trial and error.) I seem to be hovering at a 80ppm TA and a 7.8 PH right now. I then used the calculator to determine the correct calcium hardness, had to bring it from 20 to 130. It ened up at 110-120 (better but still a tad off.) More relevant to your instructions I put in the correct amount of Sodium Bromide in my case 1.5oz (300 gal hot tub) and added MPS (in my case about 1.25 oz) to create the bank... Nothing happened really. The bromine went to maybe 1 ppm... I threw in the floater and am hoping you can shed some light... Thanks! Michael How are you testing the water? (certain types of tests for bromine can bleach out at high sanitizer levels and make you think there is little or no bromine in the water when it is high.) What are the ingredients on your sodium bromide and what is the name of the product? Have you tried adding more MPS? Is your MPS a pure product or is it 'diluted' with fillers (Some of the buffered MPS products don't have has much MPS in them.) ( Did you measure by weight or volume? (measurements should be by weight) pH of 7.8 is fine for a bromine tub but a TA of 80 ppm is the low end of acceptable if you are using MPS and bromine tabs, which are acidic. Keep an eye on it. You do not want the pH of a bromine spa to crash because it can form elemental bromine. Exactly how much baking soda and calcium chloride did you add (by weight) and was the calcium anhydrous or dihydrate? Can't really help without more info. Quote Link to comment Share on other sites More sharing options...
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