"bob haller" wrote in message
...
I used to drain my tank every few months, but nothing but water ever came
out!

Worse the drain valve cracked, I replaced it the next day but 2 weeks
later the tank leaked at the valve and had to be replaced....

so these days I install a new tank and leave it be till it leaks, on
average 12 years later.

I agree. Those drain valves are crap.