Silver. oxygen.
chlorine is an alkaline and used to keep swiming pools clean. so no, i highly doubt it
chlorine or the filter
swiming
Chlorine is the most used (to disinfect and keep clean), but Bromine is also used.
=Yes they do ,if they don't keep swiming they will sink to the bottom and die.=
to keep it clean. ..
chlorine
Usually a chlorine based chemical is used. But chlorine doesn't kill it all. See link for more.
Chlorine.
To let the Sun light in and to keep the rain out. It also stops leaves going into the pools.
Plainly said, to keep the bugs out :)
to keep the water clean and kill germs