Once it is down you'll then stabilize it with pH stabilizers. Aquariums and ponds are not immune to pH swings and crashes. It's a great idea to test in the morning and in the evening for a week to get an idea of the severity of any swings in the readings. The pH changes in a small container making it impossible for us to properly test your water at our facility. It's best if you take home the test strips and perform the tests from your pond's side.
Testing is the key and stabilizers are the answers.
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