Ok I tried it again, I turned on my tester set it in a cup of that solution, I set it for 800, then I took it out the solution, put it in a cup of tap water, I got a readin' of 117... But your telling me that solution is not the right 1, so should I even be focused on what the tester reads since that 800 ppm Genesis Solution Standard Solutions Total Dissolved Solids is not the recomended solution for tha dist 3 conductivity tds meters with automatic temperature compensation HI98300/1/2/3/4 ... I about 2-3 days away from filling up my rez so I need to find out if I can use my tap water or do I have to use spring water....