Liquid chlorine is weak and cumbersome, but seems to be the safest solution as it seems to just add salt. Also raises PH as it has a value of 13.
Dichloroisocyanuric Acid and Trichlorisocyanuric Acid have Cyanuric acid, which with continued use will be too high and require a water exchange. These are also acidic and lower ph.
Calcium Hypochlorite will eventually add too much calcium, which can cause scaling and also require either a Reverse Osmosis filter or an exchange of water. This has a high ph.
I don't know much about Bromine, but I think it is only used in indoor pools.
Is there any way to use the powder form stuff without oversaturating the water with calcium or cya?
Best Answer
You don't say much about the type of pool (in-ground,above ground, lined, concrete, etc) or the environment (is freezing an issue) but our in-ground vinyl lined pool in the southern United States uses a salt water chlorinator and the water has not been replaced (aside form evaporative losses) in the 5 years since the pool was installed. It doesn't get much safer (just add salt) or easier. We get the water tested at the pool supply store and have to add a bit of this or that from time to time, but overall it is hassle-free.