Good tarp taut rubber band

I have the plans for our paddling with
Bought diameter 120cm. This way you can
clamp the tarp under the pool and our
Child they do not get pulled! Though
it is something difficult to attach the tarpaulin alone,
but 2 is doing very well. There are 4 drain holes
in the plane, so that the rain water can flow,
what works well in light rain.
All in all a good investment!