System Does Not Seem to Be Working: Solving Filtration Failure
Incorrect installation, filter bypass valve is open, or the main filter media is exhausted.
When you install a new filter system or replace cartridges, you expect an immediate improvement in water quality. If you don't notice a change, the system is failing to filter the water, and the cause is often a simple but critical oversight.
Top Reasons for Filtration Failure
| Cause | Diagnosis & Solution | Pro Tip |
| 1. Filter Bypass Valve is Open | Most whole-house systems have a bypass valve to allow water flow during filter changes. If this valve is left open, water simply flows around the filter cartridges without being treated. | Solution: Locate the bypass valve (often a lever or handle on the top of the unit) and ensure it is closed (in the "service" or "filter" position) and the main inlet/outlet valves are open. |
| 2. Incorrect Filter Seating or Installation | Filters must be properly seated to force water through the media, not around it. A missing or pinched O-ring or a filter inserted backward will allow water to bypass the media. | Solution: Shut off the water and open the housing. Ensure the filter is oriented correctly (check the arrows) and seated perfectly into the housing cap or base. Lubricate and inspect the O-rings. |
| 3. Main Filter Media is Exhausted | If the system has been running for a long time without a change, the media (especially carbon or softening resin) is completely saturated and cannot absorb any more contaminants. | Solution: Replace the filter cartridge immediately. Start keeping a strict replacement schedule based on the manufacturer's recommendations and your water usage. |
| 4. Air Lock/Trapped Air Blockage | A significant amount of air trapped in the lines can create a flow impediment, leading to very low flow, sputtering, and poor filtration quality. | Solution: Refer to Article 4, and thoroughly purge the air from the system by running a downstream tap for several minutes or using the system's air release button. |
| 5. Incorrect Filter Type Used | If the system is meant to remove sediment but you installed a filter meant only for taste/odour, the system will fail to provide clarity. | Solution: Confirm the required filter types and order (e.g., Sediment filter must come before Carbon filter) and install the correct cartridges. |