NO complaints at all yet  i do give everyone a letter explaining the way it works and the difference in the results etc. Most are not in the least bit bothered how i do it, others i have to explain it to them in more detail. Some have had window cleaners who used waterfed systems before, and none of them seemed to be impressed by the results. I then explain that if they didn't filter the water and get the tds reading down to 0 or as close to 0, that the results would have been poor. I was totally against wfp before i started using it, but i am shocked that the results can be so good, and the benifits are great. More work, bigger jobs, jobs done quicker, more money, less ladder work, less risks, better on the hands in the cold. I want to add a small van tank system now, so i can cover everything! Happy days