Dennerle Growing System - Any Fans?

I am a newby, considering bidding on a 6ft tank on ebay. It includes a DENNERLE GROWING SYSTEM. I have never heard of this but assume it enhances and maintains the water quality. Does any body have any experience of this system. I am particularly interested in the running costs and do not want to get something I cant afford to run, although I assume I can run it without the system.

This is part of what is included.

DENNERLE CO2 FISH TANK AQUARIUM - MASSIVE TANK 72'' X 20" X 18"

DENNERLE DUOMAT 1200 COMFORT CONTROLLER

DENNERLE SUBSTRATE HEATER CABLE

DENNERLE CO2 WATER FUSION SYSTEM

NIGHT CO2 CUT OFF SWITCH

Thanks.