I'm trying to increase pressure to my outside hoses for lawn watering and noticed that the sillcocks are all after my whole house water filter and they are all 1/2". Because of this, when I run the sprinklers, the whole house filter gets dirty and clogged very quickly. The plumbing from my well pressure tank is 3/4" and the pressure switch is set to 40/60.

Would I see a worthwhile pressure and flow increase to my outside impact sprinklers if I:

  • Plumb in a 3/4" tee before the whole house filter and run 1" PEX lines to sillcock valves
  • Replace existing 1/2" sillcocks with 3/4" sillcocks
  • Run 3/4" hose from sillcock to impact sprinklers

Thanks in advance!

1 Answer 1


I think your best improvement would come from adding the tee before the filter and running the new PEX to the sillcocks. I would hold off on replacing the sillcocks at the same time as adding the tee because you might not need to depending on the results from the tee. Plus, the 3/4" sillcocks might not fit through your brick walls. Do this in stages.

  • ...but depending what is clogging the whole-house filter now, you may have problems with "dirt" (currently being filtered out) plugging up the sprinklers. My "first filter" is a "spin-down" that traps debris where it can be removed by opening a valve, rather than needing a new element every time - there's a filter screen, but that gets cleared when dumping the collected gunk. Seems like someitng similar as a pre-filter might prolong the life of your current filters.
    – Ecnerwal
    Commented Aug 29, 2020 at 1:51
  • I agree with this answer and with @Ecnerwal comment except that debris may not be an issue for impact sprinklers because they typically have a large orifice. However, a low-restriction filter might be needed if in future the teed line is used for something else. Commented Aug 29, 2020 at 16:59

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.