This may be a no-brainer question, but so far I haven't figured it out. Since I winterized myself (compressed air method), I'd like to test everything out before our first trip. Problem is, I'm not...
Each time I put water in the tank with an approved potable water hose (white with blue stripe), I pour a little bleach down into the hose before squirting the water into the inlet. Keeps it clean without wasting a lot of water filling the tank all the way up then draining it. Has worked good for 26 years.