Bad Grout Efflorescence in Several Areas

I have Grout Efflorescence occurring in several areas of the tile wall (above the water line). It only occures on the "higher" side of the pool. The lot has a heavy slope and one wall of the pool is higher, holding back this area. It appears that ground water is leaching thru the tile/grout causing Efflorescence in several areas.

Solutions?

Here are a few photos, a wide and 2 close ups

http://www.title-3.com/images/pool3.jpg

http://www.title-3.com/images/pool4.jpg

http://www.title-3.com/images/pool5.jpg