Hi,
It seems like you are having the same problem that other people are having, iam assuming that you have T-Bird heads or 5000? There are different heads that fit your application. you may wish to retrograde to a taller 6" pop-up instead of a 4", but realizing that you have 300+ heads, that would cost alot. Also you may wish to mow more frequently.
Write back to let me know if this at all answers your question
Thanks
ray
Rays Above and Beyond Automatic LAwn Sprinklers
Raymond Padula Jr.
Thanks
Ray
Rays Above and Beyond Automatic Lawn Sprinklers