I have installed hundreds of them Mad, and no problems with the above mentioned disfigurements so far.

The new technology of the day in my opinion is air. When we install an iron filter we give the customer the option of using PP or air. The air pump we use is expensive, but over time will offset the cost of buying PP, so in the long run is cheaper. I have been ingesting air for 61+ years with no ill effects, but I am not so sure about PP or chlorine.

bob...