How Long

I'm using platic pipe and and attching it to platic buckets with dry wall screws . My question is how long do you think the dry wall screws last under water?

Thanks in advance.

Don't know I use deck screws

Harold i went with deck screws. I think drywall screws lasted 1 1/2 or so. With wave action the screw will shear.

+1 on the deck screws

Use enough rock in buckets and it should hold them in unless you dump them.

Agreed.