CarlD- I envy your optimism!
I actually had a question about the cartridges. So far I have been adding bleach to my pool by pouring it around the perimeter (slowly). I've never added any chemicals to the skimmers -was told not to by pool installers- I think because of the inline chlorinator being full of tricolor pucks. But the chlorinator has been emptied and cleaned out- as has the Nature2 vessel. (I just wiped both down again and they are clean. Water also flows through the empty vessel but I turned the chlorinator off so it gets just a trickle).

Does adding chemicals directly to the skimmer offer any benefits (i.e. getting full strength CL to the filters)? btw: filter pressure started at 10 and is only 11 1/2 now and very strong pressure.