On a 20x40 1 inch relates to about 500 gallons a day. That's a lot. For dye, someone on the forum recommended RIT the fabric dye. Obviously diluted. You can go to a dive shop and get a dye marker and break it apart and make dye from that. I have suggested but never used myself, beets. Get a raw beet, chop it up, boil, get a deep red dye and eat the beet. Do you notice a difference in leak rate with the pump on or off? I'd recommend making precise depth or level measurements. Could be something as simple as a ruler against the skimmer or other known point of reference. Leak rate measurements may be a clue as to the depth of the leak because as the water level approaches the leak level, the leak rate slows. As for injecting dye, for the deep areas I used a 10' piece of 1/2" PVC pipe with a small diameter auto vacuum line hose taped to it so I could squirt from a 1 gallon garden sprayer filled with the dye. You have to squirt just a little and very slowly to minimize the effect of water currents. Duct tape and silicone seal can be the adapter between the hose and garden sprayer nozzle. As for leaving it for a week...big IF. At 1" a day, no problem. 2" a day could be 14"...should still be no problem other than the water loss.
Best I can do for now.
Al
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