I live in North Central Florida. The most common pest in my pool is the predacious diving beetle. These little bast- ... buggers will actively chase you down and take a bite. It hurts but I don't think they're venomous. I read they can get up to an inch long but I've never seen one longer than a 1/4 inch. I spend the first 5 or 10 minutes in the pool searching for these beetles then scooping them up in the net and crushing them on the side of the pool.
I also frequently have backswimmer beetles in the pool as well but these generaly leave me alone unless I try to catch them. I caught one by hand once and he bit me hard. They have a long tube of a mouth they use to suck blood from their prey and he pierced my finger. I don't catch them by hand anymore. I just scoop them out with the net and send them on their way.
It is rare but not unheard of to find an alligator in your pool so always give a quick check before jumping in.
Pool Shock
Solar by far, especially in Florida. A Solar Pool heater can allow you to swim all year long for FREE.
A safe, comfort temperature for an outdoor pool in southern Florida would be about 85 degrees Fahrenheit. Most outdoor pools in Florida are not heated, and there is usually no problem in swimming in cooler water.
It matters what the average temperature is that month. Most likely, if Florida remains the same, you shouldn't need to, but it always feels better.
I am assuming by professional, you mean Olympic size. An Olympic size pool is 50 meters. The most common lap pool is 25 yards.
Every pool in Florida needs to have a barrier or safety fence around the pool. An existing structure like a fence in some circumstances may count.
Not very expensive and they can add to the appearance oif your pool. They are under $100 usually, and can go up from there.
Swimming pool is a common noun, not proper.
Maybe
Swimline and Pegasus brands are both pretty common. You can find them for sale on the www.poolstore.com website.
Common
I think its 24ft and the Orca pool 30 odd