Thanks... I may give it a shot and see how it works. When the pool was built, it had a cartridge filter (yuk) and I converted it to sand, and I didn't pipe it directly into the waste plumbing, just figured it was water, and it would work to water the lawn too. (Live in AZ)

The waste plumbing line is at the front of the house, on the opposite side of the driveway.

Actually, the grass is greener where the backwash water goes... so the chlorine levels in the water are fine.. been doing this for 4 years now.

I may try the DE.. just in the summer since that is the time the pool gets used and is toughest to keep clear (water temps 85 - 92)