Return to the Pools & Spas Forum | Post a Follow-Up

pressure testing pool supply line question

Posted by matrixunloaded (My Page) on
Wed, Oct 12, 11 at 10:52

I have read other posts here but have a specific question.

We have just installed a new auto-fill supply line. The contractor capped it at the hose bib and then ran another hose to his meter and set the pressure at 40 psi. Within 6 hours, pressure had dropped to 36 psi and by 18 hours it had dropped to 28 psi. At one point when hooking up the equipment, the pressure shot up to 60 psi until he adjusted it down.

Are these signs a reading of a bad PVC joint?


Follow-Up Postings:

RE: pressure testing pool supply line question

Your probably okay. The temperature has a lot to do with it. If it's in the shade, the pressure goes down. In the sun, it goes up.


RE: pressure testing pool supply line question

35-40 PSI is pretty standard for water pressure testing PVC. Fluctuations in air temperatures can cause fluctuations during a pressure test.

Leaks, generally, will not hold pressure for any length of time. It's best to check for wet spots around fittings. Sometimes dry fits will hold some pressure.
As a rule, I prefer to pressure test the plumbing without the equipment attached.

With that said, I've found drips in spa plumbing eventhough the pressure was holding over 40 PSI. A visual/physical inspection is always helpful!
Good luck.

 o Post a Follow-Up

Please Note: Only registered members are able to post messages to this forum.

    If you are a member, please log in.

    If you aren't yet a member, join now!

Return to the Pools & Spas Forum

Information about Posting

  • You must be logged in to post a message. Once you are logged in, a posting window will appear at the bottom of the messages. If you are not a member, please register for an account.
  • Please review our Rules of Play before posting.
  • Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review your post, make changes and upload photos.
  • After posting your message, you may need to refresh the forum page in order to see it.
  • Before posting copyrighted material, please read about Copyright and Fair Use.
  • We have a strict no-advertising policy!
  • If you would like to practice posting or uploading photos, please visit our Test forum.
  • If you need assistance, please Contact Us and we will be happy to help.

Learn more about in-text links on this page here