Sodium Bromide 2 oz packets
Hi, I use this for staring up my spa or when I need to shock it. It does take a full pack per treatment but If you buy it in bulk you can save on the shipping costs. My local Leslie's pool supply sells this for $5.49 per pack so a good deal here and if you buy three boxes (18 packs) you save shipping costs. Excellent shipping and tracking info. They even let me know the package was delivered- on time too.