Depending on the water quality, the carbon filter needs to be replaced in 6 or 12-month intervals. The crystal cartridge only needs replacement once every 2.5-3 years.
The Soft Shield Elite consists of a carbon filter and a crystal cartridge. Both have different replacement intervals.
Carbon filter (6-12 months):
The worse the incoming water quality is, the more often the carbon filter needs to be replaced. In countries with no chemical injection, such as chlorine, filters attached to the water supply need to be replaced once every 12 months.
Crystal cartridge (2.5 - 3 year):