We've got the same problem this year... YIKES!
I never ends... the spiders love our pool as much as we do....
After just a few weeks of not using our pool, the enclosure has turned into a spider haven. On Sunday, we (OK, Mr. Cube) caught 33 crab-like spiny orb weaver spiders (Gasteracantha cancriformis) and several egg sacks.
If you click on the above picture, you will get a better look at the thick mass of spiders.
This is what the little devils look like up close...
[The BLOG note: Disclaimer: all spiders were hurt in the making of this post.]