Intellichlor SWG installation question?

The Intellichlor manual says to put a check valve between filter and Intellichlor. Our PB said they usually don't put one in but I have asked him to. I am not sure that it is important or not but just wanted to be sure I didn't have any warranty issues.
 
Check valves are very important with tablet feeders, not nearly as important with SWGs. Also, the closer the SWG is to the heater the more important a check valve is. If you have 5+ feet of pipe in-between I really wouldn't bother with a check valve.
 
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