I've used the regular Microlift PBL which is a bacteria and the Sludge eater which I believe is a bacteria but a bit more powerful. I've never had an issue with either. I don't think that it is going to breakdown the leaves quickly, it's probably a bacteria product that will aid in the breakdown a little quicker. Best way is to get the net out and cover the pond or us a hand skimmer type net or grabber to get them out of the pond as soon as possible.