How Often Should I Replace the Filter in My Whole House Water Filter? 
Fortunately, once your whole house water filter is installed, there will be minimal maintenance needed over the course of its lifetime. The main maintenance requirement is replacing the filters in some of your whole house water filter components. Let’s take a look at how often you need to change these filters.
Why Changing Filters is Important
Certain whole house water filter components contain filters that need to be regularly replaced in order to continue functioning correctly. These filters are trapping sediments and debris, so they may become clogged with these substances after months of use. If they become too clogged, it becomes difficult for water to pass through. Being diligent about replacing your filters will keep your Whole House Water Filter operating at optimal performance.
Sediment Pre-Filter Replacement
The Sediment-Pre Filter comes standard in the Filter Butler FB-1000 Whole House Water Filter. This component is the first step in the whole house filtration system and takes care of removing sediment particles before water passes through the rest of the filter unit. Since this
How Often to Change Your Filter
We recommend replacing the Sediment Pre-Filter every 3 to 6 months. You can replace this filter sooner if you notice the water flow is slowing down or the water color becomes darker.
Sub-Micron Post-Filter Replacement
The Sub-Micron Post-Filter is an optional add-on for our whole house filtration system. It removes microscopic particles that the other water filter components may not filter out, including harmful protozoa such as Cryptosporidium and Giardia lamblia. This component is optional since the risk of having these particles in your water varies based on water source. Homeowners who wanted added peace of mind that their water is free from contaminants may choose to include this optional add-on regardless of their water quality.
How Often to Change Your Filter
We recommend replacing the Sub-Micron Post-Filter every 9 to 12 months.
How Can I Remember to Replace My Filters?
If you have trouble remembering to order new filters or change them out, try the following tips:
1. Mark it on the calendar. Add a note on your calendar to change your filter and purchase new filters based on the above timelines. For online calendars, such as Outlook or Google Calendar, setting a recurring event on your calendar is a great way to keep reminding yourself.
- Buy multiple filter replacements at one time.By purchasing your filter refills in bulk, you will always have one on hand for quick replacement. We sell our Sediment Pre-Filter replacements in packs of four for added convenience.
- Coordinate with other maintenance around your home.Pairing several tasks together can make it easier to remember. For example, if you are already in the habit of changing your air conditioning filter every few months, start changing your Sediment Pre-Filter at the same time.
Whole house water filters are low-maintenance workhorses but they do require some upkeep. By following these simple filter replacement recommendations, your whole house water filter will keep your water clean and safe for many years.
Source: http://filterbutler.com/blog/how-often-should-i-change-the-water-filter/