Glad to hear from you. And everything is ok, thank you for your concern. It is much appreciated. I haven't been responding to the board because I was laid up with a bout of bronchitis and a touch of pneumonia. Was out of work a few days and just started back today.
Anyway, I discussed everyone's comments with our service manager and our top pool guy, the M.D. He, specifically, stated that you have to consider flow dynamics and water temperature when dealing with this issue. In other words, when you have fast flowing water under high pressure such as exists inside a pump, the effects of caustic chemicals are greatly accelerated and will compensate for the limited time period for the event.
Is that significant? I really don't know. He is convinced that it is. He does acknowledge that others will disagree with him, however.
My service manager, on the other hand, reminded me of why we were trained to discourage our customers from pouring any chemicals directly into the skimmer in the first place. Most of them know absolutely nothing about pool chemistry and are frequently confusing sodium bicarb with calcium and CYA etc. And of course, I am reminded of this on a daily basis. We are a very busy store. Many of our customers are elderly and many are physically handicapped in many ways. Very few keep adequate care and cleaning of their pump baskets as they cannot remove the lids. Many don't even know they have a pump basket. Many of our customers do not speak English very well and some bring their own interpreters. So, basically, to be on the safe side we try to err on the side of caution. This is our real world!
I also consulted with one of our younger pool techs who stated flatly that if you add stabilizer granuals to your skimmer they not only can but WILL (he was very emphatic) clog your impeller. Though this clogging would only be temporary of course. Could this cause any kind of damage to the pump? I have no idea. I'll leave that one to the pump experts to argue.
All in all, I think they make some good points and I will continue to discourage our customers from pouring CYA directly into their skimmers, but I will not get too distressed about it if they do. I also will not push the issue here on these forums out of respect for you all.
Thanks again for your message, Richard and if you want to post this in the forum that's ok as I was about to do so anyway. Sincerely, ETS