I heard Staybrite #8 (8% silver?) is stronger solder. Are there any places I can buy it mail order or online? Thanks

I read the "Water Everywhere" post but that doesn't seem to answer my question. I own a Condo on the 2nd floor of a three story building that is almost two years old. My AC Unit is located to the right of the front door of my unit. My Central AC Unit works fine but only one problem. Water continously builds up in the pan and eventually there is water on the floor. In April 2001, the drain had to be cleared and redirected. In June 2002, the circuit breaker had to be replaced and more freon was added. I noticed water in the air filter when I replaced it in June 2002. I currently turn the AC Unit off when I'm not home, turn it on when I come home, and clean any water that is on the floor surrounding the AC Unit. The floor is starting to peel up. Looks like drywall flooring in that AC Closet. Can you provide me with any information that might help me to fix the AC Unit and the floor problem? Thank you in advance for your help.