You're good to go with AR-R, they've been taking care of our "researc" needs for years. They clean up all the shit that occurs when one of us tries buying generics somewhere else, from some dipshit company who underdoses and uses bathwater to boot. Yes, ive been screwed over one too many times by competitors. It is not a funny thing to be bullshitting around when it comes to these types of chemicals. AR-R is solid. You will not be disappointed. And if something does by chance happen where you need to communicate with them......that is when your fW#$% socks are gonna get blown off. BEST motherfing GOTTDAM customer service ANYWHERE. k enough of my ranting. but you get my point.