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<br />· Thatch should occasionally be removed to allow healthy turf growth. It is <br />recommended that de-thatching using a power rake and/or aerating be performed <br />in late fall and/or early spring when turf grass is dormant. <br /> <br />Check valves <br /> <br />· After a system is turned off, water often continues to run out of lower elevation <br />heads. This is simply because the water left in the system is draining. It is <br />possible to prevent this by installing heads that have checl< valves. Not only will <br />this eliminate the loss of water from the system after it has been turned off, but it <br />will also prevent excess wear on the system's pipes, which results from air being <br />pushed through the pipes at the beginning of each watering. <br /> <br />· There are several types and brands of heads that can be purchased with pre- <br />installed check valves. The existing heads without check valves can either be <br />replaced with new heads that already contain check valves, or depending on the <br />type and brand of head, a check valve may be retrofitted into the existing head. <br /> <br />Clogged Nozzles <br /> <br />· Clogged nozzles can easily occur over time (particularly in spray heads). It is <br />important for each sprinkler head to have the correct filter in place in order to <br />prevent the head from clogging. If a nozzle is clogged, the result will most lil<ely <br />be an irregular spray pattern. <br /> <br />· To unclog the nozzle, unscrew the cap (the cap houses the nozzle) and clean it <br />out. When the cap is off, check inside the sprinkler head riser to make sure that a <br />filter is present. If there is a filter, take it out of the sprinkler and clean it out. If <br />there is not afilter, purchase the correspondingfilter and place it in the sprinkler <br />head riser. After this has been accomplished, screw the cap back on and make <br />sure that the sprinkler is aligned properly. <br /> <br />General Recommendations <br /> <br />- Align sprinl<ler heads in such a way that the end of the spray of one head <br />reaches the next head. This head-to-head pattern creates "double coverage," <br />increasing efficiency and ensuring a more consistently green turf. <br /> <br />Space heads evenly to apply water efficiently. For example, heads that spray <br />an eight-foot radius should be spaced a maximum of eight feet apart. Uneven <br />spacing lowers the efficiency and doesn't allow for the double coverage <br />mentioned above. <br /> <br />24 <br />