Fluval U4 Internal Filter

[Michelleuk]

Hi All

I have the Fluval U4 internal filter. The flow control knob use to control the amount of bubbles coming out of the output nozzle has stop working. The water that is coming out is very strong and I want to turn it down.

Please can anyone advise?

 

[N0body Of The Goat]

Increasing the amount of the filter chamber above the water level will help, if it behaves like my one (I have to lower the relative water level to get tiny bubbles oming out of the lower vent in "c" mode, but if I lower too much the bubbles barely make it out of the vent at all).

I've got the opposite problem with mine at the mo in the 620T, the flow is dropping which means a gentle rinse of the sponges in extracted tank water and a clean of the impeller plus its cavity using vinegar to soften limescale.