what gas is used to clean i Swimming Pool.?
In most commercial pools (public pools), it's gaseous chlorine. Yes Mr Zwink, chlorine in it's natural form is a gas. It only becomes liquid or solid when it's chemically bound to another material.
The other gas used in pool sanitizing is ozone. It's just normal air that has passed through an ozonator (usually a ultra violet light source), giving the oxygen atoms an extra electron. It's then injected into the pool's plumbing lines. Usually you'll only find ozonated pools in backyards. Ozone isn't as effective as chlorine when it comes to large bather loads like you'll have in a public pool.
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