How to stop evaporation? - The Planted Tank Forum
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post #1 of 19 (permalink) Old 12-09-2014, 04:32 AM Thread Starter
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How to stop evaporation?

I have a 20 gallon long that I have to leave unattended for 3 weeks.Its at 81 degrees sitting in a room that stays around 70. The current evporation rate is 1/4 an inch or so a day. I do 1 gallon top offs every 5 days or so. Its open top with a HOB filte and 240gph cir pump.

I was thinking about a drip system from a suspended 5 gallon bucket. But how can I control the drip rate so it either has any effect at all(too slow) or over flows my tank and floods my room(too fast)?

Anyone been here before?
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post #2 of 19 (permalink) Old 12-09-2014, 04:36 AM
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Id just get a cover for the tank if I were you. All my tanks are covered as I have the same problem and im too lazy to top off 10 tanks every day lol


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post #3 of 19 (permalink) Old 12-09-2014, 04:41 AM Thread Starter
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Do you think that would stop evaporation enough to maintain for 3 weeks? My fear is the water level dropping too low and the filter running dry
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post #4 of 19 (permalink) Old 12-09-2014, 04:52 AM
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at 1/4" per day you are looking at 5 1/4" of evap over 3 weeks. If you can cover the tank it will cut that down substantially. I would avoid a drip system with a bucket like the plague. if you are going to go down the road of refilling the tank, look into float valves, you can buy them at harware stores or places like tractor supply, they let water in when the float is down and stop the water when it is up. They are not perfect, and it would require a little bit of plumbing, but its way better than a drip system you cant control. one note is that if you have inverts in the tank, most of the float bodies are made out of brass

http://www.tractorsupply.com/en/stor...ss-float-valve

lots to learn...
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as always, any comments, questions or criticisms are greatly appreciated.
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post #5 of 19 (permalink) Old 12-09-2014, 08:21 AM
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I believe your tank will get to 100 degrees if you cover based on the current 20 degree above ambient rates


have someone come over or just fix it up when you get back

I advise do not start experimental drip with no verified testing

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post #6 of 19 (permalink) Old 12-09-2014, 09:36 AM
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Quote:
Originally Posted by brandon429 View Post
I believe your tank will get to 100 degrees if you cover based on the current 20 degree above ambient rates


have someone come over or just fix it up when you get back

I advise do not start experimental drip with no verified testing
Ah no. If the tank is warmer than the ambient temp of the room it's because that is where they have the heater set. The heater will maintain that temp setting with the tank covered or uncovered. If the tanks heats up to 100 it's because of a faulty thermostat on the heater NOT because of a tank cover.
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post #7 of 19 (permalink) Old 12-09-2014, 10:08 AM
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Cover it. Three weeks is no problem with a cover.
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post #8 of 19 (permalink) Old 12-09-2014, 12:21 PM
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A covered sump would allow you to top-up to the sump and not the main tank. The overflow(s) maintains the water level in the tank, and the water amount change would show up in the sump.

MY TANK: Planted 10g; 2 x 10W CFL; Fluval U2 internal filter; MGOCPM/black sand cap

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Last edited by Django; 12-09-2014 at 12:23 PM. Reason: clarity
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post #9 of 19 (permalink) Old 12-09-2014, 12:24 PM Thread Starter
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alright, cover it is. Thanks.
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post #10 of 19 (permalink) Old 12-09-2014, 02:22 PM
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Have I not seen a somewhat recent posting on a jug added to the top of the tank so that water is let into the tank as it goes down. Others remember seeing this? Looked very clean and slick but I don't remember the details.
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post #11 of 19 (permalink) Old 12-09-2014, 02:35 PM
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Originally Posted by PlantedRich View Post
Have I not seen a somewhat recent posting on a jug added to the top of the tank so that water is let into the tank as it goes down. Others remember seeing this? Looked very clean and slick but I don't remember the details.
Wow that is old school. Did it that way years ago in my reef sump. Upgraded to a float switch after a few weeks.. It works. Hardest part is making a bottle stand. It does have the potential to make a mess as it rushes in until the suction stop the water and the level can be a little inconsistent.
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post #12 of 19 (permalink) Old 12-09-2014, 05:44 PM
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Wow that is old school. Did it that way years ago in my reef sump. Upgraded to a float switch after a few weeks.. It works. Hardest part is making a bottle stand. It does have the potential to make a mess as it rushes in until the suction stop the water and the level can be a little inconsistent.
I did not need it but it seemed to be a nice looking and very simple way to top off when a person is gone. No switches or valves needed, just simple water flow idea. Somebody here knows because they posted it not long back?



EDIT: I found the posting. This looks good to me.
https://www.plantedtank.net/forums/sh...light=auto+top

Last edited by PlantedRich; 12-09-2014 at 05:59 PM. Reason: added
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post #13 of 19 (permalink) Old 12-09-2014, 06:41 PM
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Hana I remember that thread. Actually like the idea a lot besides the fact that it would change the params of the water as I am assuming its adding back tap water


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post #14 of 19 (permalink) Old 12-09-2014, 08:50 PM
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thats like the hamster bottle topoff trick for nano reefs good call

take ball bearing out of end of hamster bottle or rabbit bottle or mutliples of them, tube goes in water and only dumps out until the level comes back up

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post #15 of 19 (permalink) Old 12-09-2014, 09:03 PM
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Hana I remember that thread. Actually like the idea a lot besides the fact that it would change the params of the water as I am assuming its adding back tap water
Only if you are putting tap water in the reserve. Put your favorite water in the reserve bottle and you get it in the tank when needed?
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