If you notice that your misters are not spraying their normal amount of water, or if you notice water pooling or running off below your system, you may have a leak. The first thing to do if you suspect a leak is to clean the nozzles.
Clogged nozzles can occur if your household has hard water. If this does not solve the problem, you will need to inspect the rest of the system for leaks, especially the tubing, fittings, and nozzles.
If you locate the leak, you will either have to mend or replace the leaking part. Parts are available in the plumbing section of most hardware stores.