The only time I completely empty my fresh tank, is for Winter storage. I sanitize in the Spring before first use. We use the tank for all water uses. I try to keep the tank at least 1/3 full, between uses, as I feel the tank stays cleaner that way. Maybe just me over thinking, but a small amount of water, left in a drained tank, would be more likely to deteriorate, in warm Summer temps. I use city chlorinated water, but if FW sits for 2 weeks or more, before next outing, I drain before refilling.
Also my FW has a whole house filter system, that all water from tank, or city hookup has to pass through.
Jerry
