Bought the house in July last summer. Had the pipes blown out last fall to prevent freezing. Now that spring has arrived - I turned on the Hyrdo Rain HR-6000 underground sprinkler system - but all I get is each head just leaking water slowly. - Is there a trick to starting up a system each year after blowing out the lines? - How do you build up pressure or how do you keep the heads in the lawn closed so you can build up pressure? - Do I manually open or close the values by the water outlet tap t...
