Mine also shipped with this unit, since it had a cartrige, I installed it innitially, yes, I was able to keep my cl down to 1ppm all summer, but for teh money you drop on a cartrige, I found that running 3 ppm in my pool is still a huge money savings in comparison and it made no difference in the way the water "feels" "smells" or "looks".
Chuck it, ebay the unit for half of original price and buy more beer.