Resolving Low Flow from Under-Sink Water Filters
Identifying and Fixing the Cause of a Water Filter Trickle
Slow water flow, often described as a trickle, from a dedicated filtered water faucet is a common issue that indicates a restriction or malfunction within the filtration system. Resolving this issue ensures the system delivers water efficiently and reliably.
| Cause (Diagnosis) | Solution (How to Fix) |
| Clogged Sediment Filter | Cartridge Replacement: This is the most frequent cause. The initial sediment cartridge is typically the first to become saturated with particulates, rust, and scale, severely restricting the water flow rate (GPM). This saturation prevents water from passing through the media effectively. |
| Kinked Tubing or Line Blockage | The flexible plastic tubing leading to or from the filter system may be sharply bent, crimped, or partially obstructed by small sediment particles that have broken free and lodged in a fitting or bend. |
| Loss of Air Pressure in RO Tank | (Applies to Reverse Osmosis systems only) The storage tank contains a pressurised air bladder that pushes purified water out when the tap is opened. If the tank loses air pressure (typically around 7-8 PSI when empty), the water flow from the faucet will be very weak after the first cup or two. |