Addy, the Pond Perfect was highly recommended to me by my local pet store owner, who works with people's home aquariums, as well as ponds, upkeeping them and cleaning them. It says, "Multi-Purpose biological pond treatment - creates crystal clear water, eliminates foul odors, digests organic sludge, eliminates scum and matts (on top of the water). Safe and beneficial for all fish, wildlife, desirable aquatic plants and turf." It doesn't actually say frogs and tadpoles and snails, but I would assume the "fish and wildlife" would fall into that category. I'll specifically ask the guy I'm going to buy trapdoor snails from if he has ever used this product and if he knows if it would hurt the snails. I had frogs galore last year, so assume it did nothing to harm them.
It's expensive at a small pet shop, like I purchased it ($85 for a gallon), but my sister found it on-line free shipping for I think she said about half that price. What I found is that everything that goes to the bottom is "connected", like a huge matt or carpet. Once I snag one edge with my small net, it will pull up a much larger area, and I just keep moving the net to place the matt into the net, kind of reeling it in. When the pond clears in an hour or so, it's amazing how much stuff is no longer there.
Like Waterbug said above, there may be some silt still left, but that's ok, I don't mind that. I guess if I had a huge amount of fish and they were constantly stirring it up and making the water murky, then I may want to remove it but there is very little left, actually, as it pretty much attaches to the other stuff in the matt.
It's a beneficial bacteria product that does double duty, in my opinion. Good luck! I'll let you know what the trapdoor snail guy says.