Ok, how many seasonal pools, or disposable pools are sold annually in the US?
According to USA Swimming and the National Swimming Pool Foundation there are 10 million Swimming Pools in the United States, with 360,000 Public Pools that stay open all year.
There are an estimated 5.2M installed inground pools in the united states
20
There are 270,000 commercial pools in the USA.
Nobody can completely answer this.
Probably quite a few
How many should have been electrically heated.
12
Probably quite a few
How many should have been electrically heated.
The US word for swimming-pools is natatoria