I looked at your site and if I get a chance tonite, I'll look at the upc and specifically at the other sections of article 610 that aren't listed on your website.
Your flow rates assume that all tubs, toilets, washer, dishwasher, sinks, etc. are all running and constantly being flushed at the same time. Actual demand at one time may be a lot less which many of the other brands at 8, 9, or 10 gpm should handle. If it was a big problem then people wouldn't be buying them. Most shower heads only allow 2 gpm at a time so a 10 gpm unit would handle 5 showers.
At any rate, good luck with your sales effort. I've personally never been offended by sales spam but some others around here have. By the way, what is the sales prices of your models 3000, 4000, and 5000 water softners? That way Pam and other readers can make their own comparisons without being subjected to a sales pitch. Thanks.