If you've been using trichlor in a feeder for over a month, your CYA is higher than zero. It would be helpful if you could get some drop-based test results, either by going to the pool store (slightly better than the strips, just resist all the stuff they're going to try to sell you) or get a drop-based kit and test it yourself (definitely the most reliable way!). We recommend the Taylor K-2006 kit available from Amato Industries, but at the very least, WalMart sells a 6-way kit for about $20 that will give you much better readings than the strips.

You probably need to shock the pool, but we need a reliable CYA number to know how high the chlorine needs to go. IF you can get that, we can help you figure it out from there.