[ftp]

Had a customer moan about water streaks on his stone porch today, blaming my pure water. Sure enough it was badly streaked. Re-constituted stone i suppose, but the funny thing is none of the stone windowsills had streaked. The only difference i could see was the lead flashing strip above the porch - anyone else found his? Does lead stain - i know it stains glass over a long period but this house is only a year old. 

[Nathanael Jones]

Lead stains if it isn't treated with patination oil when its installed. Your WFP won't stain any more than rain would,.. defo not your fault as there will be a lot more rain than WFP water hitting the stones.

[darragh windows]

Had a customer moan about water streaks on his stone porch today, blaming my pure water. Sure enough it was badly streaked. Re-constituted stone i suppose, but the funny thing is none of the stone windowsills had streaked. The only difference i could see was the lead flashing strip above the porch - anyone else found his? Does lead stain - i know it stains glass over a long period but this house is only a year old.

you always notice marks on a tiled roof coming off the lead flashing of a chimmney slows moss growth but usually takes a few years for this to happen