As said above it could be that you havent rinsed enough. When its hot i find the windows need a little more than when its cool.
Changing your resin every 2 days isnt right either
whats your tds from the tap and are you uaing ro or di obly ?
ppm @ tap is 192 ppm
ppm out filters before resin is 012
i havnt been back to check the windows yet. but her complaint was that i left the windows wet even tho i explained the whole process to her before carrying out the work. she also said she had to wipe down patio door because they was still wet and it smeared. she is also saying that it looks like i have just sprayed a hosepipe on it because there are marks everywhere.
and a hour ago she mailed me saying she has cleaned all the inside windows and they are deffinately on the outside.
she is saying its every single windows that has all spots on even tho i went over them 3 times and thoroughly rinsed them off. i have offered to come and check them out and resolve the problem but she said no. thing is one bad word goes along way.
out of the 250 tank that was used i have contacted customers before and after and they said there windows are perfect :S