No,you cannot alternate. However, you CAN do a conversion from Bromine to Bleach. It takes a LOT of bleach and your pool will look like a septic tank for a few days, then it will clear. Do a search within PoolForum on converting from bromine to chlorine for the steps you'll need to follow--and FOLLOW THEM!
If you have a sand filter you will need to replace the sand at the end of the process--since sand is about $5-$7/50lbs these days that's not much. If you have DE, you'll need to clean the filter and add fresh DE. If you have a cartridge filter, you'll have to clean the cartridge thoroughly--electric dishwasher detergent is supposed be good for that.
I suggest,if it's available, that you buy the 5 gallon carboys of 12% Liquid Chlorine that's twice as strong as 6% ultra bleach. It's far more convenient for the amount you'll need.
Once the conversion is done, you'll NEVER look back!
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