My feeder is about 9 years old and I'm trying to determine if it's working. I will fill it with 1" tabs but the chlorine level in the pool is not going up. Over time the tabs will dissolve. I do I determine what is not working correctly and recommendations on a new feeder. I've also seen a lot of posts on the bleach method BBB.. can someone point me to a good overview of that and how I would transition from chlorine to bleach

Thanks