I have those steps and we use two 50 lb bags of play sand. Do NOT use bags of river rock or pebbels. We made that mistake last year because Lowe's was out of sand, so I picked up river rock. You have not seen algae on the steps until you introduce it in there with rock..lol.
Let me know if the extra holes help. I'd love to find a way to cut down on the algae under and inside the steps.
T-

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