Somewhere on this site, someone has photos posted and I did what they recommended. I filled 3 4 inch pvc segments with rock, then glued caps on each end. This eliminates worries of the sand getting in your pool, or bags with bricks eventually breaking down. I used 3 of them which is about 25 total pounds. I really could use on more, but I'll wait till next season. Between those and the rails screwed into the deck and the steps, no problem mon!