Calcium additives

[Willito]

Currently I have 120g SPS dominant system that is being fed by a DIY calcium reator. The calcium level is around 400ppm. I just need that little bit more to put it over the top (430-450ppm). I have tried adding Kalkwasser but don't like the time consuming process of mixing the power. Perhaps liquid calcium is my solution here. Who used it, and would you recommend it? what brand and why? Any help is appreciate it.

Will -