ISS Problems

What needs to be replaced to fix the current problems they are having with
the air contaminants? I really think that if they set their mind(and money)
to it, this is an opportunity to get away from reliance on the shuttle.
They should be able to launch the equipment needed on some other type of
rocket, either Russian or American. But of course given NASA's current
track record, it would take them 3 years to figure it out. Thanks,

David