Common swimming pool pests, about 129 different species of water boatmen live throughout North America. A water boatman has an oval body with a dark-colored back and light-colored stomach. Their four long hind legs have an oar-like shape and are covered with fine hairs that help them swim. Water boatmen don't bite and often benefit the backyard because they eat mosquito larvae. As they can be a nuisance in the swimming pool, however, you can kill them by changing their habitat and removing their food supply.
Add the maximum amount of chlorine you can safely add to your swimming pool. Consult your local pool center for a water test if you need advice on the appropriate amount of chlorine.
Use a long-handled scrubber to dislodge algae from the pool walls and floor. Water boatmen feed on algae in the pool, and you need to remove this food source.
Use a pool skimmer to fish out any algae and dead boatmen bugs that float to the surface.
Mix 1 part water and 1 part oil in a bucket. Dump captured boatmen bugs into the bucket to kill them.
Repeat the process until you no longer have boatmen bugs in your swimming pool.