Let me start by saying I hate non-weighted tubing, but I have done some system maintenance on some systems that had non weighted tubing. The best way I have seen it weighted down was with zip ties and regular 5 hole house bricks.

Brad Vollmar
Vollmar Pond and Lake Management
www.texaspondmanagement.com

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What's the difference between a lake and a pond?
If you are selling it's lake!
If you are buying it's a pond!