Di system

i am trying to figure out how this whole system works, is there anything i can read that will explain? also how would one go about having the di tank filled when empty.
Thanks

Read this:

http://www.windowcleaner.com/vBulletin/showthread.php5?t=2270&highlight=beginners+guide

When your ready for a purchase or if you have any specific questions feel free to get in touch.

I will read thanks for the info.