TKS spares and repairs cost

Soon to pick up a 2008 SR22 w/ TKS.

Not had a plane with TKS before, how much might I expect to spend on spares and repairs for it over the next 5 years?

Do you have to get OEM original parts or are there alternative suppliers?

The OEM for the system is CAV,, not Cirrus.

They offer repair and spares at very resonable rates. So far my total expense was a pump overhaul at 300 USD.


Thanks Bernd