Liquidator -- how much drop in feed as chlorine is used?

I've read that the Liquidator's feed concentration drops as the chlorine level in it goes down, but I'm not at all clear how much of an issue this is. Some people say that this is a deal breaker, while others say that the drop isn't all that much. Does anyone have any estimate for how fast the drop is compared to the drop in chlorine that's currently in the unit? In other words, how much stronger is the feed when there are 8 gallons of chlorine in the unit compared to when there is only 1 gallon left? It's not a direct ratio, is it -- i.e. it wouldn't be 1/8th as much feeding at this point, would it?

Thanks,

Larry