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Message: [QUOTE="BKHpondcritters, post: 444238, member: 11074"] When I imagine trying to carefully squirt waterfall foam into the spaces between the flagstone & then trying to press gravel into the top the only scenario my brain can come up with is a mess. I'm seeing hands & fingers covered in foamy gravel, or the foam expanding up out of the cracks & getting everywhere but where it's wanted. Maybe I'm just a messy builder, though. :oops: I wouldn't worry about using a vacuum on the bottom - just a nice net to scoop up leaves & other large debris. The bottom IS going to get covered in a nice thin film & some algae, to a greater or lesser degree off & on during the year (more in late winter/early spring, less as the rest of the pond plants get going in summer) Fish & tadpoles will eat what's growing there too, which helps with the maintenance, but you have to remember it's a POND, not a hot tub. (my mantra when things don't look as nice as I'd like & need to gain some perspective. lol) One other important thing to consider, though - The flat stones WILL be very slippery to walk on! Almost as bad as bare liner. If you're planning on wading around a lot, I'd skip the flagstone & just do gravel. I walk in my pond a lot & NEVER step on the large flat rock that covers the fish cave - it's too dangerous for an old lady who tends to break rather than bounce. :sneaky: [/QUOTE]