Automatic water top-off - The Planted Tank Forum
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post #1 of 6 (permalink) Old 03-16-2004, 02:10 AM Thread Starter
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Anyone have any ideas for a cheap way to make an automatic water top-off system?
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post #2 of 6 (permalink) Old 03-16-2004, 02:11 AM
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2L pop bottle upside down in the water. Ugly, but it works...
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post #3 of 6 (permalink) Old 03-16-2004, 02:15 AM
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I have been thinking about the same thing too, but haven't found anything good...boy, aren't we lazy! It seems allot more complicated than just pouring the water in ourselves. Though, I see how it could be useful if you are dealing with allot of evap or aren't around for a while.

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post #4 of 6 (permalink) Old 03-16-2004, 02:24 AM
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i'm going to be doing an open-top soon, so I'm going to need it too.
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post #5 of 6 (permalink) Old 03-16-2004, 11:41 AM
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If you have a sump....and we usually don't in this hobby... you can set up a topoff system from a reservoir or tap. Alternatively, a guy in my club setup a system using a lawn sprinkler timer and an over flow to 'change' 5% of his water every day. That would keep your tank topped up. I will be visiting him on Saturday and will get the specifics if you like.


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post #6 of 6 (permalink) Old 03-17-2004, 12:51 AM
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You could also check out some reef and marine sites, such as or They have lots of different designs for top offs, some using air pumps and switches. I've got a similar problem in my 10gal reef tank, and i'm going for an old school design...a plastic jug on a stand with a hose out the bottom and a valve! Hey, it'll work, just won't look pretty!


75 gal - 2 Magnum 350's, Turbo Twist 3x UV Sterilizer, 260w Aqualight, 250w Ebo Jager, Pressurized Co2: JBJ regulator/bubble counter, aluminum 5# cylinder, DIY External Reactor.
10 gal Reef - AC Mini w/Chemi-pure & Phosguard, AC 201 PH, 96w Aqualight Power Quad, ~7# live rock, ~5# Aragonite sand, Frogspawn, Mushrooms, Hammer, Brain, Osc. Clown & 6-line Wrasse.
20H FO Saltwater - AC 200 w/Chemi-pure, 24" Dual Shop light w/ Coralife 50/50 bulbs, 15# Aragonite sand, ~11# lava rock.
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