Glass wine bottles would add unnecessary weight. Go to recycling center and search for plastic bottles that will fit into the black corrugated pipe. Or use swim noodles small or large dia ones stuffed inside the black drain pipe. UV quickly rots the swim noodles however they should last forever inside black drain pipe. That black corrugated drain pipe is UV resistant and lasts a real long time to exposure. That pipe is made in white, yellow and black depending on mfg. Do as in the one video and use expanding foam to seal the ends or optional use a standard drain pipe cap. Seal the cap inside and outside with expanding foam and or silicone or builders caulking. They sell the corrugated drain pipe in diameters of 3",4", and 6". I know that a 2 liter soda bottle fits very tightly inside a 4" black drain pipe.
An optional idea would be to use a thin wall PVC sealed frame instead of a wooden frame that will water log and later loose most its buoyancy. PVC frame could be built into various shapes with PVC pipe connectors.
In nature floating islands can develop enough natural buoyancy that they themselves float.
Editor Lusk has a BioHaven floating island on his main pond but never says much about it in the magazine nor what he planted on it. .
Last edited by Bill Cody; 02/16/22 11:17 AM. Reason: PVC enhancement
