OK, the bonded Crystalite laps do need a moderate water drip. I don’t see why you can’t filter and reuse it, but I would not use the same liquid for polishing. Remember, we’re talking about sub-micron particles, and the filter probably isn’t that good. Personally, if I use a bonded lap, I use distilled water (88 cents a gallon at Wal-Mart) and a couple drops of Jet-Dry. Dawn dish soap will work, too.