Just bought a house with a pool in Texas and every time i clean the skimmers i find Wolf spiders and what looks like the fishing spiders. I had 3 wolf spiders in a skimmer yesterday and one was covered in baby spiders on it's back......It's kinda hard to kill spiders unless you (or your bug guy) can spray them directly. You have a bunch of spiders simply because there is an ample food source for them. Kill their food, and they will go somewhere else. Killing the mosquitos and gnats is easier said than done. However, with the treat of Zika and West Nile, I've been fogging the yard 2x per day for the last few months. We are getting far fewer mosquito bites, and I'm seeing a lot few arachnids creeping around the pool and in the house lately.
On a related note....when they started building the house next door several months ago, we got inundated by spiders. A few of the wolf spiders were the size of my hand. I didn't know we had tarantulas here in Texas!
I am no spider lover it an it is beginning to freak me out. I am going to spray around the pool and start fogging regularly as my back yard is currently a haven for critters. Also, the previous owner put a 50x6 ft section of the yard as loose stones for some reason which i swear is harboring most insects. Astro Grass is going down... praying this helps as cleaning the skimmers is now becoming a daunting task