Clear2o Replacement Water Filter made with Solid Carbon Block Filtration Technology (3-Pack), CWF503

I bought clear2o filters (they say cwf500 on the product) and look exactly like filters i bought before, but to my irritation they won't fit. why not?

Is it possible to recycle the used filters?

What is the difference between the advanced and basic filter packs?

Will this fit the CWS-100 pitcher?