How do you pour bleach solution into the fresh water tank to sanitize it?
We had trouble sanitizing our water tank. The hatch for the water input flips up blocking any access to a funnel or a jug that can be poured into there. How do people pour the bleach solution in to sanitize their tanks?

We are thinking of getting an aquarium pump to do it.

A simpler solution might be to use something like this which you can connect in line with your hose or hoses and add the bleach to the container. This would probably be easier and cheaper than buying a sump pump. https://a.co/d/0gkqAmWD
Another even cheaper solution would be to just use a funnel to add the bleach directly to your hose then connect to water to let the water push it into the tank. Solves the same issue with a cheap funnel. I'm new to the RV world and picking up my Pebble in a couple weeks so if any seasoned RVers don't think this would work, please share.