Kent Tech CB Calcium buffer part B

[h2o]

I have a gallon of part A and B, the part B is instructed to shake before use. Today I noticed a thick big crust of built up at the bottom of this bottle, i assume it's calcium built up. So i shake it vigorously before pour 10ml into my tank. my question is: Is this bottls still good to use, i have it only 8 months. thank you.

 

[scruz]

I use the same stuff,the part B will settle slightly if it gets below 60 degrees F according to the bottle. I ve found I get a few 'marbles' after it's been opened with no adverse effects using it.It solved my ph/alk swings.