Ive been exterminating for over 30 years. Its been almost 10 years since I used a Birchmeier and now i remember why, after just a little bit of use I had chemicals running down my back . Pump leaks , wand leaks, I called Domyownpestcontrol and the gaskets are ridiculous , i called Birchmeier and they said they would ship me some over a month ago which didn't come.
These sprayers are overpriced vintage technology. Eventually the brass nut in the back loosens and it will leak on your back. I've had 4 of these units over the years and they have all eventually leaked. They're battery operated backpacks for half the price that work with no pumping.
I have purchased nine Birchmeier backpacks, five of which have been in the last year. Birchmeier is well aware of a major defect: leaky seals. If you were thinking that you will beat the odds and get a backpack that doesn’t blow out on you I think you’re seriously fooling yourself. More than a decade ago this brand was very reputable but somewhere, some bean counter in the top office decided to save a whole dollar by downgrading the seals. Trust me when I say you’re going to be replacing parts all over the place and seal kits are incredibly expensive. DONT DO IT. And this is coming from a guy who, to date, in 2018 has dropped $1500 on this brand.