Evaporation Rate & ATO?

What evaporation rate could I reasonably expect on a 200 gallon tank with a 45 gallon sump/fuge?

Just starting to research ATOs and was wondering what sort of size of tank I will want for reserve water.

Thanks

 

At least 2 gallons a day.

I use 1.5 Gal. 150G display, 40 sump, 30 refuge

 

my 75gal with a 20gal fuge goes through .75gal-1gal a day dependant on how the relative humidity is in the sump room.

 

I agree with the estimates above, but humidity in you area would impact that a lot. I live in Houston (very humid) and still evaporate 1/2 gal per on my 55.

I would estimate 2-3 gal. For planning 3 if you are in a dry area.

Just my thoughts,
M

 

Thanks everyone. So are all of you using ATOs? If so, what size is your storage container?

Based on the above estimates, I think a 15-20 gallon ATO container should be fairly effective?

 

That would get you close to a week. I would think that would be good.

M

 

Direct plumbing, no reservoir.

 

Im doing direct plumbing from my RO/DI unit to one of the following float valves dependant on which ATO we're talking about

Eshopps Float Valve Kit with Holder - $24.99 : TB Aquatics - Top Quality Aquarium Products, Aquarium & Drinking Water Filtration, Amazing Service!
Float Valve - $9.95 : TB Aquatics - Top Quality Aquarium Products, Aquarium & Drinking Water Filtration, Amazing Service!

just remember you need to have a auto-shut off valve on your ro/di if you pipe it directly

 

Plumbing a RO/DI direct to a sump or tank is not recommended and highly discouraged. If the float valve or switch fails you flood your system with fresh water.
It is always recommended you have a top off reservoir with a limited capacity so if something fails you can only inject a certain amount of fresh water into the system doing less harm. Another big disadvantage is called TDS creep. When a RO or RO/DI starts frequently you get spurts of high TDS water until the membrane has a chance to clean itself up. If you put this in a reservoir the effects are minimized, especially if you use float switches set some distance apart so you do not start and stop as often and in effect dilute the TDS. With float valves the level only has to drop a short distance and the RO cycles on and off again constantly causing lots of high TDS water to enter the system.

 

I use a Rubbermaid tub for my reservoir. I think it holds in the 15-20 gal range and it does fine on a system a bit larger than yours.