Outdoor Frag Tank in So Cal - Looking Good

Love this idea and been enjoying the videos, thanks. I have dreams of doing something like this with the help of a greenhouse (maybe with a roof that opens) in southern colorado. My place has 300 day of sunshine a year and good temps...until winter anyway. But I think it might be easier to warm the water than to cool it.
 
I'll let the OP speak for himself, but I doubt it makes a huge difference. I don't know the surface area of his frag tank, but even an inch or two over that area seems like it would vanish in a system of that volume. If he really is evaporating 50 GPD as an earlier post implied, that would be less than 1 days swing if the ATO stopped.
 
Maybe it is just dilution with the rest of the system, but I'd expect it still take a minute or two to mix properly. Seems like in a downpour it could throw the salinity out of wack.
 
i'm pretty sure that tank has a cover for when it rains. This is Socal in the middle of an exceptional drought, it almost never rains.
 
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