I have the 2 dose system Kent tech cb or our 37gal. Works great, I'm very careful about dosing.
Anyways we've only had the bottles for 2-3 weeks and the Alk (part b?) feels like it has rocks in it now.
Is this normal? Cross contamination of the bottle chances were close to 0. And should it still be "good"?

Thanks.

Same thing for me too! I shake it every day before I added it, and started noticing it sounded different when I shook it. I emptied it into a glass, and sure enough chunks! I am trying to get it mixed back up right now with little success. Any idea's would really be appreciated.

Do you rinse the syringe between dosing part a & part b? The only reason it would solidify is getting part A into part B.

yes I rinse well, and only used a syringe the first time(to figure out 1 capful was aprox 6ml) and don't dose either during the same day. So contamination possibility is low.

Very odd

luckily the stuff still works well