I have a problem sort of like in the post "CALCIUM TOO HIGH". My calcium keeps rising and my alk is reading pretty low. I'm using Red Sea tests. My calcium is now up to 600 from 450 just two weeks ago. The alk test doesn't actually give you number readings but it's reading on the "low" end of the color scale. I don't use any calcium additives. I do have the Kent Marine Tech CB two-part system and was wondering if I could use just the part B to help with the alk? It says to use both parts though so I'm not sure what to do. I thought if I use just the part B that I could start controlling the alk without raising the calcium any more.