A Secchi disk is a round metal object that’s painted black and white. The disk is attached to a string and then lowered into a pond until it’s at a depth where it can no longer be seen. This is called the Secchi Depth.
Purchase a Secchi Disk (Test Assured) from Nualgi Ponds Dealer & Friend: Cali Koi and start testing your Secchi Depth.
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