Hey Justin !!!!!
Were you responsible for Frankenfiltering that, or did you move in that way ? Is something wrong or are you just curious ?
We never recommend multiple filters, it's simply not needed. The largest residential filter for each style will do plenty fine for 40k+ gallons. I have 500 carts on 34k gallons and can go more than a year between cleanings. So you only go 11 months. Boo.
*I clean twice a year just becasue. The filters don't need it, I do.