I have a problem and need some help and suggestions to resolve. I placed a envelope of tank blaster in both my black water tanks with the hopes of getting the sensors to work. Continued to use tanks for next 2-3 weeks and tried to drain today. Both my macerator system on one tank and the second tank, a free flow would not discharge. Please let me know if you can help or offer some suggestions....thank you....Bill Tomchuk, Winnebago Vista 35F, 2015