I havent seen many ponds with the rocks filled in like that, but it's pretty mellow to watch the water disappear out of sight.
And functional, too.
I've been thinking about installing a pond here for so long.
I've always wanted one - I once worked in a pet store that had a pond and I enjoyed caring for it.
Did you install an ultraviolet sterilizer? I think a UV light would really keep the water clear and you wouldnt have to worry about overspray of any chemical additive you'd be adding to the water to keep it algae free. The light would do it for you.