yep I have a chapin 25 gallon..i have 3 seperate "concentrate" tanks, one for gly, one for cleth and one for a liquid fertilizer from GRO...thinking about getting another for a fruit tree spray...the only issue is the concentrate tanks are like 2 gallons or something...so you have to buy your chems in bulk....cleaning the system is super easy...just set the amount of concentrate desired to the highest level (I think its a level 7 or 15oz/gal) and run water through there and whichever part it went through (boom or wand) and run it for a few minutes...i really like this system and except when I installed a new pump and not primed all the air out of it it has worked very well
I'd recommend taking it apart once a year to clean out the concentration dial holes. Mine gets gummed up and it has happened a few times where I sprayed for a couple hours and then realized my concentrate tank never dropped and the spray didn't smell. Plastic on mine just broke last weekend causing a massive leak. I'll probably get another one since I already have 3 tanks (Gly, pond friendly gly and Bifen for keeping mosquitoes out of the yard).