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This is how you determine your replica rock. Water flow test for branching type 1. Prepare 1 pail of water. 2. Submerge your replica rock into water. 3. Once it filled up with water, pull out imediately. 4. A good well ventilated flow of replica rock will give 5 to 6 seconds to drain its water. 5. If this test fails means it cannot be used, you will need to drill or punch more holes into the replica rock until this test pass. The more holes created the better it is. (Note)
