Which Dosing unit to buy?

[George]

I am using a marine magic doser. It's almost half the price of some other dosers. Have been running it over a year without any problem. One of the sponsors here, caco3, seems to start carrying it or whatever they are trying to do with it. Check with caco3. If not, go to ebay and search for marine magic, or marine color, same stuff, different names.