gray holding tank

Besides all of the below reasons, nothing worse for a FWT than to have a little bit of water standing in it for extended periods of time. It will turn green, especially in warm weather.
Keep it FULL !

edatlanta wrote:
I always keep my fresh water tank full or close to it even when hooked up to fresh water. Water lines break and pumps fail, etc. and that can leave you with no water. But we all have an emergency supply available, our fresh water tank.

I do switch from city water to my fresh tank about once a month and use it by showers or laundry. I then fill it back up for the next time.

Works for me and when others in the park are screaming due to no water, I'm doing fine.

I always keep my fresh water tank full or close to it even when hooked up to fresh water. Water lines break and pumps fail, etc. and that can leave you with no water. But we all have an emergency supply available, our fresh water tank.

I do switch from city water to my fresh tank about once a month and use it by showers or laundry. I then fill it back up for the next time.

Works for me and when others in the park are screaming due to no water, I'm doing fine.

Moved from Forum Technical Support

Your topic says gray tank. But your question concerns the potable tank?
You do not need to sanitize the potable tank until you want to use it. As for gray tank? Close the valve a day before you dump black tank. When black tank is empty, close the valve and flush the dump hose with the gray water.