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Old 07-14-2004, 08:18 PM   #1
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evaporation rate and top offs

i'm trying to setup a auto-top off for my 20g sump. the sump is attached to my 65g tank with 2x250MH lights. I may have room for only a 1-2 gallon top-off tank. will that be enough or will i lose that much in a day? what's a good estimate for a week of evaporation? i know it's impossible to be accurate, but i need a ball park figure. thanks
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Old 07-14-2004, 08:26 PM   #2
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YOu will proably lose that much per day. I lose about 5 gal a week on my 75 with just 440W of VHO. One thing that does affect evaporation is the amount of surface movment you have and if you have a glass cover over the tank.
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Old 07-14-2004, 08:29 PM   #3
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thanks fishfreek, i was afraid of that. i won't be using a cover and i will have a mag9.5 with an scwd for circulation.
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Old 07-15-2004, 07:35 AM   #4
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I generally lose about a gallon a day with 110w of PC on my 55 w/10g sump, both uncovered. Been a little less the last few days, really humid around here this week.
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Old 07-17-2004, 12:33 AM   #5
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I'm losing about 5 gallons per week from my 40gal system, including a 10gallon sump.

I use a simple powerhead attached to a timer pushing water through an irrigation dripper. The powerhead runs for about 6 x 2hrs each 24 hr period.
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