RC Low pass filter not working

It looks correct, assuming the right connections to the jack terminals.

Is it a 10k potentiometer?

Check connections. I think you said in another thread you did not have a multimeter. You should get one. If you were in the US I’d say go to Harbor Freight and you can get an adequate one for under $10, I don’t know about where you are.

There might be something helpful here:

And by the way, no big deal but around here we prefer to add to an old thread about a topic like this, if you can find one (using the search facility), over starting a new one. It’s easier for someone looking for information to find it all in one place that way.

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