The pump already comes with a small prefilter. What he is saying is that there are so many of the petals getting sucked onto the prefilter, that they could stop the flow. I do have another suggestion, which is either a great one, or a terrible one. What you could do is take off the prefilter so that the petals just get sucked in and pushed right back out. The problem would be if something the size of an actual cherry were to get sucked onto the intake, it would block it completely, and the pump would burn out. I wonder if there is a way you could position the pump so that nothing of that size could get to the intake? This would be a bit of a gamble while you are gone. Will anyone else be home to ensure the water keeps flowing?