Combi flue / plume water ... Is it corrosive?

[Safety First]

Not meaning the small 1" white pipe that runs from combi out into the gulley, but the water that drips from the flue exhaust..... Is it pure? Or acidic...

Reason being I had a plume kit fitted and am wondering if the water that drips off is going to affect the polycarbonate roof that the plume kit goes through..?
Thanks.

 

[Lower]

Slightly acidic. But my understanding is that there shouldn’t be anything dripping from the flue. Anything that condenses in the glue should run back into the boiler.

 

[Madrab]

Yes, it will stain the polycarbonate over time.