What are the difference between 10" and 20" filter cartridges?

Whole-house filtration and UV systems come in only two sizes - based on the length of the catridges: 10" or 20".

The filtration capability of both - is the same. 

The filtration capability between different branded systems - is the same.

The only differences are:

a) the quantity of water flow that each cartridge can deal with;

b) the servicing cost of the cartridges.

Remember:

10" systems: are designed for your average NZ residential home.

20" systems: are designed for commercial properties, irrigation systems, and larger than average residential properties (3+ bathrooms).