We purchased a home with exisiting pool and it has a "Pool Frog" mineral and chlorine device. I asked the previous owners pool cleaner about it and he said it was expensive to run and recommended we just remove it. I did a google search and it looks like we'd need to purchase replacement mineral "pac's" and chlorine "pac's"....and it looks like we would replace the clorine pac every 1-2 wks. At $18 per pac it's very expensive, compared to $3-4 for a gallon of 10% chlorine. I didn't see a topic here and am wondering if a PB can advise? I'm taking over maintaining the pool.