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it's not that big a deal. any daily changes aren't even noticeable and even out over time. it takes a long time for the change in evaporation to add up for most sumps (might be an issue if you have a *tiny* return chamber in your sump). so i only have to fiddle with it once a month if that much. and you can get a 'topoff module' that lets you tell the litermeter to dose just a little more than you think it needs, then when it hits the float it turns it off. so it's the best of a 'float based' and the best of a 'fixed amount' in one unit.
but it costs 300 bucks....
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