Why can the ceramic in Coldstream FTO+ filters come loose?
The ceramic in Coldstream FTO+ filters can sometimes become detached from its base. Several factors can explain this problem: insufficient bonding during manufacturing, the fineness of the ceramic, the weight of the filter when filled with water and the shocks caused during handling of the upper tank.
Sometimes insufficient bonding on the base
The ceramic is fixed to its base using a bonding and sealing material. During manufacturing, if the operator does not apply enough glue, if it is poorly distributed or if it does not properly cover the entire contact area, the fixing may lack strength.
The filter may then appear correctly assembled at first, then gradually come loose under the effect of humidity, weight and repeated handling.
A heavier filter when filled water
After use, the microporous ceramic and internal filter media remain impregnated with water. The wet filter therefore becomes significantly heavier than a dry filter.
When the upper tank is tilted to empty the remaining water, this additional weight exerts greater stress on the junction between the ceramic and its base. If the bonding is insufficient, the risk of separation increases.
The shock when the upper tank tilts
When the tank is tilted while the filters are still installed, they can hit the wall or the bottom of the tank. The weight of the wet filter amplifies the force of the shock.
This lateral pressure is directly transmitted to the bonding zone. A single significant shock, or several repeated small shocks, can weaken the fixing and end up detaching the ceramic from its base.
A relatively thin ceramic
The ceramic envelope of the FTO+ filter has a thickness of approximately 7 mm. This design promotes the passage of water, but also makes the element more sensitive to shocks, twists and mechanical stress.
A more compact or reinforced ceramic near the base would offer better robustness, particularly during dismantling, cleaning and emptying the tank.
How to limit the risks?
It is preferable to remove the filters before tilting or turning the tank over superior. The filter must be handled by its base, without exerting pressure on the ceramic.
If the ceramic becomes mobile, cracks or separates from its base, the filter must no longer be used. Its watertightness and filtration performance can then no longer be guaranteed.
In summary, detachment can result from an insufficient quantity of glue during assembly. The fineness of the ceramic, the weight of the filter when it is impregnated with water and the shocks when the tank tilts can then accelerate or cause the separation.
