Stenner users: when do you refill your tank

I was waiting til half to 1/4 left. The other day I waited till almost empty because I wanted to see if any residual on bottom of tank. Glad to report after 45 days nothing on bottom and refilled up. I guess the only downfall of waiting so long is the bleach may loose % after being in heat so long even though my equipment area is covered by a sail to keep the sun off. I will say the gallon that was left in tank was still yellow and smelled of bleach!
 
I add about 6-7 gallons at a time, so whenever it looks about half full, I bring the level back up. I figure a mixture of old and new bleach will keep the chlorine level consistent over time and I won't have to fiddle with my timer settings much. I'm adding bleach to the container about every 2 weeks. Seems to be working fine.
 
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