Three options:

1. A new sand filter (I'm mentioning this, just because it is an option, not because I think it's what you want.)

2. A Pentair (Rainbow) Leaf Eater with a sand/silt bag
Leaf Eater @ Amazon
Sand/silt replacement bag @ Amazon

3. A Pentair (Rainbow) Leaf Trap with sand/silt bag
Pentair Snap-Open Leaf Trap R211084 @ Amazon
Pentair Model 186 Leaf Trap Sand / Silt Bag R211518 @ Amazon

Info pages:
http://www.pentairpool.com/pool-pro/...-eaters-85.htm
http://www.pentairpool.com/pool-pro/...180-186-92.htm