Inline fertilizer dispenser

Anyone using an inline fertilizer dispenser for an automatic watering system on their garden? What kind are you using and are you happy with it?
I have been looking for an inline setup to use with my system (standard garden hose in and standard garden hose out) and had seen several setups before but can’t seem to find them now. The only ones that I can find now are the “E-Z Flow Systems” and the “Inline Siphon Sprayer” setups. I was thinking of going with the Inline Siphon Sprayer, but noticed that it dispenses a little more quickly than I would like.