Yep works, but best on shorter lengths of pipe as on 18m of bent tubing getting all the sand in and out is a pain in the A. But, it does work well, really stops the kinking. 1/2" external pipe benders (just like a spring ) can be had for less than $10. Not sure how doing 18m would be but good for the ends as they are the only bit you end up having trouble with.
Do not under any circumstances get the sand wet.
JD