Carbon media in a whole-house tank removes chlorine and some organic compounds from the water. Sediment media, whether loose media or pleated cartridges, traps particles before they reach fixtures and appliances. Both are consumables. They do their job until their capacity is used up, and that capacity depends on your water and how much you use, not only on how many months have passed. This guide explains how to find the right schedule and recognize when the media needs attention.
Find the interval in writing
Ask the installer for the manufacturer's replacement guidance for the specific media in your tank. Some guidance is based on volume treated, some on elapsed time, and some on a pressure drop across the housing. Get the basis in writing. If the company cannot tell you which one applies, that is a sign to ask more questions before you accept a service plan.
Signs the media is tired
Watch for a return of chlorine taste or odor at the cold tap, which often means the carbon is saturated. Lower flow or a noticeable pressure drop across a sediment housing usually means particles are building up. Discoloration after a plumbing disturbance, such as a main repair nearby, can mean the sediment stage is working harder than it was designed for.
Do not assume a sediment indicator or a gauge means the carbon is still fine. The two stages fail in different ways, and checking one does not confirm the other.
Who does the change
Many households can swap sediment cartridges themselves if the housing and the replacement part are clearly labeled. Replacing carbon media in a tank is usually a service visit. Before you book it, ask whether the tank is opened or backwashed, whether the company disinfects or flushes the tank after media change, and what the total visit includes beyond the media itself.
Keep the record
Log each media change with the type of media, the water source, and any meter reading if your system has one. Note the next planned check. Over several changes, that log shows you how fast your water uses up the media, which is more useful than any general rule. Store it with the rest of your service paperwork so the next technician can see the history without asking you to reconstruct it.