HELP!

500 Gallon Liner Pond is finally looking beautiful. Fish, clams,
frogs, turtles...got a great thing going....water clear.....

Now losing Water like crazy! Lost 3 inches in 4 hours! Cannot find a
leak to save my life. Waterfall was made with liner covering the
whole thing....I have a feeling the leak is on the bottom or side.

Does anyone know of a manufacturer of a drop in (fed up with liners)
resin pond with these specs: 8 feet long x 3 feet wide x 4 feet deep?

I would be forever greatful!