The difference between the Filtatank Twin and Triple cartridge rainwater filtration system is the addition of a 5-micron poly spun filter cartridge (in stage two of the triple system). This cartridge is designed to capture finer particles following the 10-micron pleated first stage cartridge. This will protect the silver carbon cartridge which is only designed to absorb colour, taste and odour and doesn’t prefer a lot of dirt particles.

The twin system is ideal for the standard size family home with decent quality rainwater. If the water is quite dirty and brown in colour and there is a high demand on the filter system then we recommend installing the triple cartridge filter system.