Quote Originally Posted by nthach View Post
You can also buy cal hypo tablets too - I know Leslie's can order it from PPG.
cal hypo tablets cannot be used in an unvented erosion feeder! To do so is dangerous. There are special cal hypo feeders available for cal hypo tabs .
Also you should NEVER mix trichlor and cal hypo. It can cause an explosion!

There are several brands of cal hypo tabs besides the PPG ones but they all dissolve rather fast so they are not suitable for erosion feeders. They are used in skimmers or special vented feeders.