WATER PURIFIER FOR A POOL
The invention features a water purifier for purifying water in a pool having a volume less than about 13,500 gallons. In general, the water purifier (10) has a threaded fitting (22) that allows it to be removably-attached to a water-exchange fitting (20), preferably on the side of the pool. The water purifier contains a purification material for purifying the water. The purification material preferably can be a silver-containing material.