Thanks for all the replies.
Many of you say to position valves a certain way?
Here is a pic of my water panel.
The bottom two are the drains for the heater and the fresh water. One is marked winterizer. There is one more behind the shower head but I think its for the water filter behind the panel.
2wheelglider who or what is Anderson that you reference? could you post a link to the web site?
I am able to fill the tank no problem but yesterday I removed the screen / washer on the inlet to the hose connection and found there is a check valve installed so there is no way I could add the bleach with out pressure to over come the valve.
Thanks again for all your replies.