I would get another setup if you like the juice. You might be able to rewick your 10 dollar pod thing, but it doesn't look particularly awesome, and you can get better, refillable pods if you like the pod dealio, that will likely hold up better and be easier to use, reuse, rewick, etc.
You juice is probably high in gunking factors too, but even that should NOT turn it that dark almost immediately, so I'm going to agree with your pod needing to be replaced, either with another cartridge to see if it will help before shelling out more money on a better pod system.
It would be my inclination to go with a higher quality pod mod, but I don't use pods at all, so that's just an opinion at this point.
Anna