Probably got some gunk built up in those lines. I recommend a purge product, their are several out their try not to get to strong of a formula. A couple are recommended here. I like Swirl Away seems strong but not to strong. Could be because it's available at our local plumbing wholesaler. Be prepared to rinse out the tub a bunch. Make sure to take your filters out. Follow the directions. I use a bit more than is recommended.
If you're lucky, weekly shocks may get rid of some of the build up for you. Make sure you don't let the sanitizer levels drop too low...that may be the cause of the build up in the first place.
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