Hi MCR:

Like everything, Chlorine has its benefits and its drawbacks. Most of us here are convinced that the benefits of pool sanitation with Chlorine so far out-weigh the drawbacks that it's a no-brainer. Chlorine is simple THE best all-around sanitizer, algaecide, and consumer of stuff like sun-tan lotion, ammonia and ...urine.

Bromine seems to be the better choice for hot tubs as it stands up to heat better, but all the other alternatives to Chlorine are expensive and do not work very well. Skin and eye sensitivity, and allergic reactions are much rarer than people think, and usually are the result of bad water monitoring and treatment, not the chlorine.

Products that kill or inhibit algae can help you use less chlorine, but on a cost-base valuation, they usually fall short. Copper does kill algae, but it stains pools and hair, especially blond hair.

Good luck!