Release chemicals to test the red spray in bag, bag of chemicals spread by all sides. Verify that the absorption into the Red Sea or the zipper? If a septic tank to show that leaks. Did not pass?
Remove red substance injected into the bag to be tested. Then the chemicals spread through the bag all over the field. Make sure that the red penetrated into seals or zipper or not. If depression goes to show that not leak through.
The chemical injection test red to put it in a bag. Then spread along the bag over chemicals in every aspect. Check that the red absorbed into seal or zip? If absorbed to show that leak, failed.