Pentair and Jandy make fine mesh bags -- usually referred to as sand and silt bats -- for their products. Usually, these bags are interchangleable. Please note that they will NOT capture algae and pollen dust.

Here are links to those products on Amazon -- the second link is a cheaper no-name version, probably Chinese. It may work fine, but it may also be junk. The Pentair bag should be fine, so long as you understand the limitations mentioned above.

Pentair R211286 Sand/Silt Bag Replacement Leaf Eater 185 Pool and Spa Safety Equipment



PoolStyle PS454 Fine Mesh Leaf Eater Bag