madep Posted March 31, 2014 Report Share Posted March 31, 2014 When I do a weekly shock with the 3 step bromine system, how do I know how much bleach to use? I only have 8.25% bleach available and my tub holds 500 gallons. Is the bleach amount based on the amount of water in the tub or the free bromine level? Thanks in advance for the responses! Quote Link to comment Share on other sites More sharing options...
Spanky Posted March 31, 2014 Report Share Posted March 31, 2014 It's dependent on the water volume and bleach strength. You want to spike the Br to approx 12 to 15ppm. The rule of thumb is 2oz of 6% bleach per 100 gal. With 8.25% I'd suggest you use 7-8 oz for 500gal . Once you add the bleach run the spa uncovered for about an hour then check the Br level. Once the Br drops below 6 then you can allow bathers back in the spa. Don't forget that shocking is net acidic so check your pH after the Br returns to normal. Quote Link to comment Share on other sites More sharing options...
madep Posted April 1, 2014 Author Report Share Posted April 1, 2014 Thanks! Quote Link to comment Share on other sites More sharing options...
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