I think I bought it in 2010. They sell a repair kit with seals, springs, etc... for maintenance. I think I bought that in 2017 (order emails from Rittenhouse don't list items ordered, just an order number, so I'm making some assumptions here). It's due for that again ($50) as it drips a little/valve not closing all the way. I'd consider that "scheduled maintenance" kinda like changing oil the car, so not a knock as something I wish it did better.
Otherwise, nothing. It's been bullet proof. I think the only time I've taken it apart to clean it was when I used the repair kit. Of course we flush it well after use as part of the rinse process. Use it with imidacloprid and fertilizers, no problems at all.
The only thing I wish it had is a reset button on the flow totalizer. So if I know I need to treat a tree with a total of 20L, I could reset it to 0, then know I'm done when it gets to 20...like a trip odometer. But its like a regular odometer. I'm sure there's a way to do it, but not easily. I could look at it and tell you how many total liters I have put through it in its life (I'll try to remember to look tomorrow).
Bottom like: nothing that stops me from giving it a full recommendation. Buy one. (I think I also added a quick connect to easily switch from this to spray gun).
