The very first thing to try is to blow air in the tube to see if it is 100% blocked. If air is flowing freely, you may want to check that the slider valve on the front of the pump is set to max (completely toward the +).
In many cases, simply blowing some air through the tube solves the problem.
The next question is has the tower sat idle for a period of time? If so was it cleaned before shutting it down. Often times, a blocked tube is do to calcified material in the tube or manifold.
If this is the case and the tower has no plants in it, then you can do a deep clean of the water system by following these steps:
- Remove the reservoir
- Fill it half way with hot water
- Add 3 capfuls of either vinegar or hydrogen peroxide
- Replace the reservoir
- Replace all the drain tubes in the reservoir
- Run the pump until the water has reached room temperature
- Repeat steps 1,2,4,5, and 6
- Remove the reservoir one last time
- Clean and rinse the reservoir fully
- Repeat steps 4 and 5.
This should loosen any calcified nutrient or algae in the manifold and tubes.
If these steps do not solve the issue, please contact us at firstname.lastname@example.org