One additional application of ultraviolet radiation (UV) — and a potential complement to a UV system — is ozone.
While many ozone generators use a corona discharge (CD) unit to
create this disinfecting gas, others use UV to split oxygen
molecules (O2) into individual oxygen atoms (O), which
then join into ozone (O3) molecules.
UV and UV-generated ozone are often paired for extra disinfection
power — especially in places like Europe and Australia, where
many cities impose limits on the levels of hazardous chemicals a
pool can contain.
When combined with chlorine generated electrolytically from salt
water on-site, options like this can provide comprehensive
disinfection and sanitation systems that eliminate the need for
regular chemical dosing and storage.
The main downside of a setup like this is the lack of ability to
superchlorinate or shock the water in case of a contamination
In such a case, the only option is to clear the pool of bathers,
then manually add chlorine to the water until its concentration is
10 times normal. Once the water is sanitized, the remaining
chloramines can be filtered and diluted out, and the pool can
return to business as usual.