Anti-siphon frost free hose bibs
#1

Last summer the anti-siphon frost free hose bib on the back of the house lost about 50% of it's pressure. Currently it will not run a sprinkler or cause the soaker hose to send up spouts. It takes a long time for the water to reach the end to a garden hose and has a difficult time when one is holding the hose of the ground. Is there an easy fix or sohould a proffessional be contacted?