Vince,
what Sammy's trying to say is...you have a 75Gal. tank right? and you put substrate and live rock(lr) in it right? well, each rock displaces an equal amount of water. So, if you had a few rocks and your substrate in the tank you would have displaced or lost 10Gal. of real water capacity...follow? basically you want to drip from the gallon container 1 drip a second, and I need a chart, but he's saying it would take 280milligrams to raise the calcium rating of the whole tank 1part per million(PPM). The last thing is if you put it in slowly like that and you test your ph, alkalinity, and calcium, it wouldn't take too long to figure out just how much(mgs) to put in on a continual basis to keep the calcium at a desired level of 400-450. I haven't used kalk yet, it's been way to complicated without someone like these guys to break it down for me, but am thinking about it especially if I can grab some pickle stuff for a couple bucks and try it myself. anyway, good luck.