Having to keep the pool clean is quite the job, and costly. This year we tried Baquacil, which is chlorine-free and is a sanitizer and algistat all in one. It comes in a half gallon container. We use to treat our pool daily, but with Baquacil its only once a week. Once you get good balanced readings for your pool, you only have to add once a month. One thing i like is you don't get that chlorine odor, and the pool is crystal clear. Before using Baquacil we found the water to be hard and the chlorine to damage our hair and burn our eyes. The cost is a little more than the stuff we use to get at Walmart, but the results are so much better. If you can, have your water readings checked often. I will continue to use this product, and recommend it to all pool owners.
Update On May 02, 2010: This is a must to keep those pools clean and sparkleing. We find treating once aweek does the job. Be sure to try this and you can't go wrong if you want that clear pool.