Different lakes may be different but I don't know of any restrictions. I have used pvc and tree tops and they both work. If you use pvc, be sure to rough up the pvc first to help promote the algae growth. I also tie a bottle on the top when I drop it in to help keep it standing upright. Good luck with whatever you decide to do.
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Dwyane
The only place where success comes before work is in the dictionary!
SMILE- A curve that can set a lot of things straight!