We update stage-4 filter of the Replacement filter set for Purify guru,PG-400-AZ.
From T33-“coconut shell activated carbon” to T55-“Remineralizer”.
The T55 use the shell as same as the old T33. No more “add-on unit”, simple removing T33 and installing T55 in the stage 4 will be fine.
The T55 content both activated carbon and remineralizer at the same time.