What Do You Use To Make Floating Rings?

[Julles]

My $1.75 PetSmart lilies are really growing.  But I have four in one 30 gallon tub, and all their pads are getting mixed up.

I'd like to keep them seperated.  I've read on here that some of you use floating rings. 

Just what would those rings be made of?  I once had a flower pot made of black styrofoam, and I sliced that into rings, but those are all gone now, and they were too large anyway.

What else would work?  If I get hose or tubing from the hardward store, how do you know it will float?

Thanks

Julles

[Esther]

Hollow plastic tubing will float if it is sealed where it comes together so it can't fill up with water. Use  a little piece of doweling at the seam and glue it, holding it together to dry with a clamp.

[Holldoll]

My husband made me some with the black stuff that you use to insulate pipes.  It's like a foam, you can get it at any hardware store. It comes in 6' lengths for a couple bucks.  He used a pvc in the end to hold it together.  They worked REALLY well.  Some of them I had to weigh down with rocks because it was floating them too high. 

[Ky Kim]

I believe some people have made them with the swimming noodles, and sprayed them black.

Kim

[Jerry]

half inch drip irrigation tubing

[Esther]

The tubing is better because the noodles and pipe insulation are both quite big around, whereas the tubing isn't. If you have some old hula hoops, they will work. If they are too large, take out the staple and then take out the doweling at the seam. Cut off what you don't want and put it back together with a tad bit of caulk at the seam.