http://reefkeeping.com/issues/2006-02/rhf/index.php
how to make it if you want someone to show you: 7th video on this website
http://www.reefvideos.com/ the one that says dowflake
http://www.bulkreefsupply.com/Calciu...1_2/index.html
http://www.bulkreefsupply.com/Calciu...1_4/index.html
youll have to see for yourself if its cost effective or maybe go about a different way. for me it works great since its just a 28, this stuff should last me a long time