Typically TOC is not a concern because ionic contaminant measurement levels are more critical.
Filters are a very important component in the system.
Typically, they last years in a system because the water is so pure to begin with. There are two factors that are considered when selecting a filter. The most important is total ionic contaminants and rinse-up to 18 Megohm. This is an indication of the cleanliness of a filter. The electronics industry cannot afford to have any sort of ionic contaminants or metals in their water for rinsing.