The best way to add calcium

[Aquattro]

Tigger, you're better using the 2 part solution. Also, do you use kalk to maintain levels? You can get it cheap from Shao. Using turbo calcium is going to increase your chloride levels over time, and that isn't a good thing. You should only use it for one time adjustments. Really the best and cheapest way is to use kalk to maintain levels.
Also, a note on seachem products....I wouldn't dump that crap in my tank if you paid me!! Anytime I used it in the past, I got major ugly algae problems. Most people I talk to report the same thing.