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This year's model of the aquarest ar-600 has a different filter pedestal for the cartridge. These are great to have when replacing my filter every 3 months. They look just like the name brand ones and fit into my slot as expected.
Instructions give clear directions for chlorine spas but no mention of bromine. It has no effect on water. But my skin has itches and had sores ever since began using this product. It says bromine free spa.