Four Stage Standard RO Reverse Osmosis Replacement Water Filter Change Kit.   (2) 5 micron sediment Pre Filters, (1) 10 micron Carbon Block Filter and (1) Inline GAC Post Filter.  RO reverse osmosis membranes sold separately.  

Five Stage Standard RO Reverse Osmosis Water Filter Change Kit.  Includes (2) 5 micron sediment Pre Filters, (2) 10 micron Carbon Block Cartridges and (1) Inline GAC Post Filter. RO Reverse Osmossi Membranes sold separately. 

Discontinued - Dow Filmtec ® TFC 24 GPD RO reverse osmosis membrane - standard size 1.75" X 11.75" # 93430

The correct replacement is the Pentair-TLC-24-Membrane.  You will receive the Pentair replacement membrane when placing your order for the discontinued Filmtec membrane.