How To Backwash with Jandy Never Lube 3 Port Valve

[kobeman08]

May seem like a dumb question, but I need to backwash a pool and have no idea exactly how to do it. It's a DE filtration system. The DE was recently changed, but the PSI is now over 10 above what it should be and was told I need to simply backwash it.

Jandy Never Lube 3 port valve part # 4717. Motor is a Hayward Max Flo II. The engine was changed about 6 weeks ago and Filters changed as well (with DE added). Normally it runs fine for about 6 months before the DE has to be changed. But the PSI went up recently too much.

The valve itself doesn't have any written setting. It's all the way to the right with OFF all the way to the left. I don't know how to backwash with it.

Help appreciated!