I haven't diluted any chemical with water on a regular basis in my entire time in the business. Even when I first got in the business I was using the turtle wax hyperconcentrates that used double draw eductors and were thick and don't recall problems with them. It is sometimes hard to find "just the right tip" on the ultralean hydro tips because the ratios differ quite a bit from tip to tip. So I may have to run a product a little stronger than I like to get the proper result. So my chemicals costs may be a little higher than they have to be but in the scheme of self serve I'm not sure it moves the needle on my profitability enough to worry about. But then again mudmoney above says he uses a yellow tip in a 30 gallon drum and that sounds crazy diluted, maybe I need to try some!
I assume the clogging tips come from poor practices by the operator on site. If a chemical company in this day and age can't make a product that can't run through a pink hydrominder tip without clogging I'd question their overall quality control. I use some of the smallest tips with Quest
drying aids and don't think one has ever clogged. I do try to maintain good hygiene when it comes to chemicals- I drill holes in the screw on caps and run my 1/4" hydrominder tubing through them. No containers are left open to the environment. The only problem I occasionally have is when I double draw a dye into a foaming wax for tri color and the red dye tip occasionally clogs, I assume they don't play well together.