I'm wanting to use condensate tablets monthly to keep the primary drain line clean. If I understand it correctly, the tablet needs to go in the pan that's under the panel marked A in the picture. However, that panel is sealed shut w/ not only screws, but a grey colored caulk-like goo around the edges. If I were able to get the tablet through the line w/ the float switch (marked B), would that get me on the primary pan?