I currently have a pond measuring 10′x15′,approx.1700 gallons with a pump rated for 3,000 gph.can I use my existing equipment to convert over to a “pond less” waterfall or would I need supplemental/different equipment?

To convert this pond to a pondless, you might want to make the basin smaller. But you will not be able to use the skimmer. You will have to purchase the Pump vault and some of the AquaBlox boxes. The count depends on the size of the basin. You will also need to purchase rocks, river rounds and decorative gravel. All the other equipment can be reused.