I notice the manufacturer of Kieseritealso offers a slightly more abrasive formulation for blasting natural rock waterlines and pebble-tec. This would solve my situation exactly: I have an 83-foot pool with about half of it incorporating a rock waterline. The rock has become badly calcified. The pressure-washer driven tool that coryp linked is very appealing: I already own a powerful pressure washer. The calcification is already exposed on my pool -- the water level has dropped. My preference would be to get in an inner tube, float around, and blast away, vs. draining the pool substantially.
So I see only one serious impediment to doing this whole job myself, and one minor one. Can anyone help me brainstorm answers?
1) Biggest problem: How can I vaccuum all of the blasting media off of the bottom of my pool when this work is done? I don't mind buying a piece of equipment to help in this process, or putting in some hours of manual labor.
2) Where can an ordinary joe buy Kieserite in non-industrial quantities?