Hi, thanks for reading. We have an Aquarite control panel. It had been showing salt at 3000 ppm up to a couple days ago when I put it into "service" mode so I could run the pump 24/7 (trying to clear up black algae). Therefore, the salt readings were not displayed. We shocked the pool both days it was in service mode. Today I turned the service mode off briefly and the salt read 200 ppm. Immediately dumped 7 40-lb. bags of salt in the water. It's now been 7 hours and the salt is reading 0 ppm. Is this possible? Or is something wrong with my readings? I checked the system and from my very limited knowledge it seems to be operating properly. I ordered one of Ben's PS234s test kits today, and will test the water as soon as the kit arrives. I do not know what any of my other levels are, other than AquaRite at 50%. Do I need to have a service call, or somehow test the water now before the test kit arrives? If so, should I buy the strips or bring the water to Leslie's for testing? I've never brought water in for testing--how should the sample be taken, and what should I put it in? Thanks in advance for any advice.