[travelin texans]

The dealer added water to mine at the PDI, I never added anymore, we didn't boondock with the last RV, I opened the 1/2" drain when we pulled out of the lot & for months later if we parked at different angles still had water running out.
This is just a reminder that you will never drain all the water out so leave the drain open all winter, there won't be enough in the tank to harm anything when it freezes but could freeze/bust the valve if closed.