For crying out loud people, we KNOW that draining doesn't work !!!!
Like RJ says, KEEP IT Full !!! I been preaching that for years !
The problem is when you drain it, it does not drain dry. Nothing worse than a little water standing, it'll turn green in a short time.
The very first thing I do when I get home is fill the FWT to the very tip top.
Rich
'01 31' Rexall Vision, Generac 5.5k, 1000 watt Honda, PD 9245 conv, 300 watts Solar, 150 watt inv, 2 Cos 6v batts, ammeters, led voltmeters all over the place, KD/sat, 2 Oly Cat heaters w/ ox, and towing a 2012 Liberty, Lowe bass boat, or a Kawi Mule.