Anyone here ever use Roundup Max? I bought a gallon jug of concentrate & mix it in a 15 gal sprayer & use it on my property, problem is if I have a gallon or 2 left over & it sits for a month or 2 it gels up or gets these thick stringers that clog up my screen in the tank & is basically useless

. Is there any other herbicide that won't do this

Crap is $85 a gallon