I use one of JIMD's kalk reactors on my Texas 240 gallon nano. In addistion I use ESV B- ionics. IMO there is nothing better! Simple. simple and simple. I changed over from using a calcium reactor. With the system I now have my calcium, alk and PH is right where I want them. My tank is packed with sps corals so my calcium demand is very high---yet I am able to to keep it at 450!!!!!
Jim