nice post.... i had to return the aquashield it was over a year old, the shop puts there price over the exp date it had black sedament could be ok but i did get bad calmag twice if it looks a orange milky color or has sedament its bad and will cause sick plants. everything at my 3 shops in my area is always to old but the prob is they dont have ac they have fans on and ruin all there qrganics what a shame. keep calmag in the fridge. got some bonide sulfer powder to try out i hope it wont kill the roots or plants.