We've had our pool for 3 years and now for the 3rd year we've had a problem with biting flies in our backyard. They show up around this time and will last about a month before dying off due to cold temps. I'm wondering if the cover that accumulates on the winter cover is a breeding ground for these pesty flies. My poor dogs can't even go out in the backyard without being attacked by these flies.

Anyone else heard of this or experienced this?

Can I add bleach to the water on the cover or will that ruin the cover?