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I would call my dealer.do both filter look brand new?
The purple filter is a microban filter (inhibits the growth of bacteria on the filter media) and should go on your cric pump side. If I was buying a second set just get the std filters and save the money of the microban as it will cost more. Your choice.
It is a microban filter and I agree with Jacuzzi Jim - don't waste your money on a microban filter.I use them interchangably and my tub actually came with 2 microban filters. BTW the screen filter opening is the circ pump opening.I thought Artesian went away from the microban filters and have disposable now ... I'll be looking into that when the time comes to buy new filters.
. . . . BTW the screen filter opening is the circ pump opening.