Last year someone posted that a family member sprinkled cornmeal in a water basin and stopped a leak for 4-5 years. I tried it and it is working for now.
For two years I have fought a small leak that must be in a rocky area I really don't want to take apart. When I started up this spring, there was no leak. Finally it started, I figured some winter debris plugged it, and thought of the cornmeal.
I just threw handfulls in while the pump was running just to circulate the stuff, threw more in when the pump was off but the water was in slower motion, then more when it was still.
After 48 hours of breezy, mild weather, my water went down less than 1/4 inch and stabilized. In that time I usually lose 3-4" of water. I just turned my system back on--I turn the water over rapidly-- and want to see if the "plug" unplugs with the currents.
Has anyone else tried the cornmeal trick or anything similar? A couple more days will tell in my pond and I'll post the results.