How does your water look? That chlorine reading of 5ppm means it could be 5 or higher but there is no way to know. You really need to order a Taylor K-2006 or 2006C as it is the only type of kit that can measure chlorine higher than 5. For now, you can use a dilution method to force your kit to read higher. It does lose accuracy with dilution, but it is better than nothing.

Testing Without a Good Kit