Hi Fuzz, Yes there is a way to narrow down a leak. I used this method to find a leak in a situation just like yours. There is a pre requisite though. It works only with PVC pipe. Somewhat dangerous, but a man with your background knows what precautions to take. Remember the old trick of gathering worms? Introduce a voltage potential into the water, and use a probe whit a voltmeter. The higher the reading, the closer the leak. I used a isolated variable transformer and shoved a wire down the suspect tube. For the probe, I used a peace of PVC tube and attached a gutter nail. You get the picture. I was lucky, the leak was not under concrete. I don't know what could be done with a leak under a concrete slab. Now if any one has any suggestions as to how to narrow down a leak under a concrete slab, I sure would like to know about it. I am toying with an idea of a miniature camera, but have bin unable to find a suitable candidate for such a modification. Ty Tiberius Kraemer BLUE STAR ELECTRONICS 3312 Silverton Rd. NE Salem, Oregon Phone: 503 391 1491 ty1k@xxxxxxxxxxx -----Original Message----- From: techassist-bounce@xxxxxxxxxxxxx [mailto:techassist-bounce@xxxxxxxxxxxxx]On Behalf Of Janet Fantauzzi Sent: Monday, March 22, 2004 6:19 AM To: techassist@xxxxxxxxxxxxx Subject: [TechAssist] Off Topic / Swimming pool liner leak in ground Morning, In need of a way to locate a leak in a in ground swimming pool for neighbor. is there a chemical I can add to see where the leak is or any ideas accepted. sorry for this post but they do need help. Thanks fuzz Fantaj Retired Belle Vernon, Pa. 15012-9669 ---------------------------------------------------------------------------- - Lost Password: http://www.tech-assist.org and select "Login Problems?". Email Archives: //www.freelists.org/archives/techassist/ ----------------------------------------------------------------------------- Lost Password: http://www.tech-assist.org and select "Login Problems?". Email Archives: //www.freelists.org/archives/techassist/